I am confused about using `freeze_support()` for `multiprocessing` and I get a `Runtime Error` without it. I am only running a script, not defining a function or a module. Can I still use it? Or should the packages I&#39;m importing be using it?

[Here][1] is the documentation.

Note that the specific issue is about `scikit-learn` calling `GridSearchCV` which tries to spawn processes in parallel. I am not sure if my script needs to be frozen for this, or the some code that&#39;s called (from the Anaconda distro). If details are relevant to this question, please head over to the more specific [question][2].


  [1]: https://docs.python.org/2/library/multiprocessing.html#miscellaneous
  [2]: https://stackoverflow.com/q/24363300/938408

where to put freeze_support() in a Python script?

    #include &lt;queue&gt;
    using namespace std;

    class Test{
	    int *myArray;

            public:
	    Test(){
		    myArray = new int[10];
	    }
	
	    ~Test(){
		    delete[] myArray;
        }

    };


    int main(){
        queue&lt;Test&gt; q
        Test t;
        q.push(t);
    }

After I run this, I get a runtime error &quot;double free or corruption&quot;. If I get rid of the destructor content (the `delete`) it works fine. What&#39;s wrong?




Double free or corruption after queue::push

I&#39;m a new Android programmer and recently, a lot of my projects have been getting this error:

    07-31 23:45:19.592: ERROR/AndroidRuntime(716): java.lang.RuntimeException: Unable to start     

    activity ComponentInfo{com.amrit.musifind/com.amrit.musifind.Main}: 

    java.lang.NullPointerException

Can anyone help me solve this problem?


Here&#39;s the entire logcat stack trace:


    07-31 23:45:18.512: INFO/ActivityManager(63): Starting activity: Intent {     
    act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000   
    cmp=com.amrit.musifind/.Main }
    07-31 23:45:18.682: INFO/ActivityManager(63): Start proc com.amrit.musifind for activity   
    com.amrit.musifind/.Main: pid=716 uid=10025 gids={3003}
    07-31 23:45:18.962: INFO/jdwp(716): received file descriptor 20 from ADB
    07-31 23:45:19.102: DEBUG/ddm-heap(716): Got feature list request
    07-31 23:45:19.572: DEBUG/AndroidRuntime(716): Shutting down VM
    07-31 23:45:19.572: WARN/dalvikvm(716): threadid=3: thread exiting with uncaught   
    exception (group=0x4001aa28)
    07-31 23:45:19.572: ERROR/AndroidRuntime(716): Uncaught handler: thread main exiting due 
    to uncaught exception
    07-31 23:45:19.592: ERROR/AndroidRuntime(716): java.lang.RuntimeException: Unable to    
    start activity ComponentInfo{com.amrit.musifind/com.amrit.musifind.Main}:    
    java.lang.NullPointerException
    07-31 23:45:19.592: ERROR/AndroidRuntime(716):     at    
    android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2401)
    07-31 23:45:19.592: ERROR/AndroidRuntime(716):     at    
    android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417)
    07-31 23:45:19.592: ERROR/AndroidRuntime(716):     at    
    android.app.ActivityThread.access$2100(ActivityThread.java:116)
    07-31 23:45:19.592: ERROR/AndroidRuntime(716):     at   
    android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
    07-31 23:45:19.592: ERROR/AndroidRuntime(716):     at   
    android.os.Handler.dispatchMessage(Handler.java:99)
    07-31 23:45:19.592: ERROR/AndroidRuntime(716):     at       
    android.os.Looper.loop(Looper.java:123)
    07-31 23:45:19.592: ERROR/AndroidRuntime(716):     at   
    android.app.ActivityThread.main(ActivityThread.java:4203)
    07-31 23:45:19.592: ERROR/AndroidRuntime(716):     at    
    java.lang.reflect.Method.invokeNative(Native Method)
    07-31 23:45:19.592: ERROR/AndroidRuntime(716):     at   
    java.lang.reflect.Method.invoke(Method.java:521)
    07-31 23:45:19.592: ERROR/AndroidRuntime(716):     at   
    com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
    07-31 23:45:19.592: ERROR/AndroidRuntime(716):     at   
    com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
    07-31 23:45:19.592: ERROR/AndroidRuntime(716):     at   
    dalvik.system.NativeStart.main(Native Method)
    07-31 23:45:19.592: ERROR/AndroidRuntime(716): Caused by: java.lang.NullPointerException
    07-31 23:45:19.592: ERROR/AndroidRuntime(716):     at   
    com.amrit.musifind.Main.onCreate(Main.java:44)
    07-31 23:45:19.592: ERROR/AndroidRuntime(716):     at 
    android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)
    07-31 23:45:19.592: ERROR/AndroidRuntime(716):     at     
    android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
    07-31 23:45:19.592: ERROR/AndroidRuntime(716):     ... 11 more
    07-31 23:45:19.612: INFO/Process(63): Sending signal. PID: 716 SIG: 3
    07-31 23:45:19.612: INFO/dalvikvm(716): threadid=7: reacting to signal 3
    07-31 23:45:19.642: INFO/dalvikvm(716): Wrote stack trace to &#39;/data/anr/traces.txt&#39;
    07-31 23:45:21.422: INFO/Process(716): Sending signal. PID: 716 SIG: 9
    07-31 23:45:21.442: INFO/ActivityManager(63): Process com.amrit.musifind (pid 716) has   
    died.
    07-31 23:45:21.583: WARN/UsageStats(63): Unexpected resume of com.android.launcher while    
    already resumed in com.amrit.musifind
    07-31 23:45:21.712: WARN/InputManagerService(63): Window already focused, ignoring focus    
    gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@439559d0
    07-31 23:45:23.482: DEBUG/AndroidRuntime(725): &gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; AndroidRuntime START    
    &lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;
    07-31 23:45:23.482: DEBUG/AndroidRuntime(725): CheckJNI is ON
    07-31 23:45:23.812: DEBUG/AndroidRuntime(725): --- registering native functions ---
    07-31 23:45:23.832: INFO/jdwp(725): received file descriptor 20 from ADB
    07-31 23:45:24.193: DEBUG/ddm-heap(725): Got feature list request
    07-31 23:45:25.052: DEBUG/AndroidRuntime(725): Shutting down VM
    07-31 23:45:25.052: DEBUG/dalvikvm(725): DestroyJavaVM waiting for non-daemon threads to   
    exit
    07-31 23:45:25.062: DEBUG/dalvikvm(725): DestroyJavaVM shutting VM down
    07-31 23:45:25.062: DEBUG/dalvikvm(725): HeapWorker thread shutting down
    07-31 23:45:25.062: DEBUG/dalvikvm(725): HeapWorker thread has shut down
    07-31 23:45:25.073: DEBUG/jdwp(725): JDWP shutting down net...
    07-31 23:45:25.073: DEBUG/jdwp(725): +++ peer disconnected
    07-31 23:45:25.073: INFO/dalvikvm(725): Debugger has detached; object registry had 1   
    entries
    07-31 23:45:25.093: DEBUG/dalvikvm(725): VM cleaning up
    07-31 23:45:25.113: DEBUG/dalvikvm(725): LinearAlloc 0x0 used 665652 of 4194304 (15%)
    07-31 23:47:22.712: DEBUG/dalvikvm(104): GC freed 9173 objects / 524184 bytes in 149ms


Heres the 1st activity: start.java

    package com.amrit.musifind;

    import java.io.BufferedReader;
    import java.io.InputStreamReader;

    import org.apache.http.HttpResponse;
    import org.apache.http.client.HttpClient;
    import org.apache.http.client.methods.HttpGet;
    import org.apache.http.impl.client.DefaultHttpClient;
   
    import com.amrit.musifind.R;
  
    import android.app.ListActivity;
    import android.content.Intent;
    import android.os.Bundle;
    import android.util.Log;
    import android.view.View;
    import android.widget.AdapterView;
    import android.widget.AdapterView.OnItemClickListener;
    import android.widget.ListAdapter;
    import android.widget.ListView;
    import android.widget.SimpleAdapter;
    import android.widget.Toast;
    import android.app.Activity;
    import android.os.Bundle;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.TextView;
 
    public abstract class start extends Activity implements OnClickListener {
   
	Button buttonGo, buttonReset;
	EditText EditTextinput;
	String input = &quot;&quot;;
	String ur = &quot;http://www.tastekid.com/ask/ws?q=&quot;;
	String l = &quot;&amp;f=musifin2125&amp;k=mjjlnzkyzwuz&amp;format=JSON&quot;;
    String url = &quot;&quot; ;
	
	/** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        buttonGo = (Button) findViewById(R.id.buttonGo);
        buttonReset = (Button) findViewById(R.id.buttonReset);
        
        EditTextinput = (EditText) findViewById(R.id.EditTextinput);
        
        //Button listener
        buttonReset.setOnClickListener(this);
        buttonGo.setOnClickListener(this);
    }

    public void onClick (View src){
        switch(src.getId()){
            case R.id.buttonGo:
                input = EditTextinput.getText().toString();
    			url = ur + input + l  ;
    			        		
 			    Intent Main = new Intent(this, ToClass.class);
           		Main.putExtra(&quot;userurl&quot;, url);
           		startActivity(Main);
    	        break;
    			        	
           	case R.id.buttonReset:
           		EditTextinput.setText(&quot;&quot;);
           		break;
   			}
   		}
    }
        

The second activity: Main.java

    package com.amrit.musifind;

    import java.util.ArrayList;
    import java.util.HashMap;

    import org.json.JSONArray;
    import org.json.JSONException;
    import org.json.JSONObject;
    import org.w3c.dom.Document;
    import org.w3c.dom.Element;
    import org.w3c.dom.NodeList;

    import com.amrit.musifind.JSONfunctions;
    import com.amrit.musifind.R;

    import android.app.ListActivity;
    import android.content.Intent;
    import android.os.Bundle;
    import android.util.Log;
    import android.view.View;
    import android.widget.AdapterView;
    import android.widget.AdapterView.OnItemClickListener;
    import android.widget.ListAdapter;
    import android.widget.ListView;
    import android.widget.SimpleAdapter;
    import android.widget.Toast;
    import android.app.Activity;
    import android.os.Bundle;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.TextView;

    public class Main extends ListActivity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.listplaceholder);
        
        Intent intent = getIntent();
        String url = intent.getExtras().getString(&quot;userurl&quot;);

        ArrayList&lt;HashMap&lt;String, String&gt;&gt; mylist = new ArrayList&lt;HashMap&lt;String, String&gt;&gt;    
        ();
       
        JSONObject json = JSONfunctions.getJSONfromURL(url);
                
        try{
        	JSONObject earthquakes = json.getJSONObject(&quot;Similar&quot;);
            JSONArray info = earthquakes.getJSONArray(&quot;Results&quot;);

            for (int i = 0; i &lt; info.length(); i++) {
                HashMap&lt;String, String&gt; map = new HashMap&lt;String, String&gt;();
                JSONObject e = info.getJSONObject(i);

                map.put(&quot;id&quot;, String.valueOf(i));
                map.put(&quot;name&quot;, &quot;Name:&quot; + e.getString(&quot;Name&quot;));
                map.put(&quot;type&quot;, &quot;Type: &quot; + e.getString(&quot;Type&quot;));
                mylist.add(map);
            }
        	
        	JSONArray  results = json.getJSONArray(&quot;Results&quot;);
        	
	        for(int i=0;i&lt;results.length();i++){						
				HashMap&lt;String, String&gt; map = new HashMap&lt;String, String&gt;();	
				JSONObject e = results.getJSONObject(i);
				
				map.put(&quot;id&quot;,  String.valueOf(i));
	        	map.put(&quot;name&quot;, &quot;Name:&quot; + e.getString(&quot;name&quot;));
	        	map.put(&quot;type&quot;, &quot;Type: &quot; +  e.getString(&quot;type&quot;));
	        	mylist.add(map);			
			}		
        } catch(JSONException e) {
        	 Log.e(&quot;log_tag&quot;, &quot;Error parsing data &quot;+e.toString());
        }
        
        ListAdapter adapter = new SimpleAdapter(this, mylist , R.layout.main, 
             new String[] { &quot;name&quot;, &quot;type&quot; }, 
             new int[] { R.id.item_title, R.id.item_subtitle });
        
        setListAdapter(adapter);
        
        final ListView lv = getListView();
        lv.setTextFilterEnabled(true);	
        lv.setOnItemClickListener(new OnItemClickListener() {
        	public void onItemClick(AdapterView&lt;?&gt; parent, View view, int position, long id) {        		
                @SuppressWarnings(&quot;unchecked&quot;)
	        	HashMap&lt;String, String&gt; o = (HashMap&lt;String, String&gt;) lv.getItemAtPosition(position);	        		
                Toast.makeText(Main.this, &quot;ID &#39;&quot; + o.get(&quot;id&quot;) + &quot;&#39; was clicked.&quot;, 
                    Toast.LENGTH_SHORT).show(); 
    			}
	    	});
        }
    }


Lastly, my manifest file: AndroidManifest.xml

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;manifest xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
        package=&quot;com.amrit.musifind&quot;
        android:versionCode=&quot;1&quot;
        android:versionName=&quot;1.0&quot;&gt;
        &lt;uses-sdk android:minSdkVersion=&quot;4&quot; /&gt;

        &lt;application android:icon=&quot;@drawable/icon&quot; android:label=&quot;@string/app_name&quot;&gt;
            &lt;activity android:name=&quot;.start&quot; android:label=&quot;@string/app_name&quot;&gt;
                &lt;intent-filter&gt;
                    &lt;action android:name=&quot;android.intent.action.start&quot; /&gt;
                    &lt;category android:name=&quot;android.intent.category.LAUNCHER&quot; /&gt;
                &lt;/intent-filter&gt;
            &lt;/activity&gt;
            &lt;activity android:name= &quot;.Main&quot;&gt;
                &lt;intent-filter&gt;
                    &lt;action android:name=&quot;android.intent.action.Main&quot; /&gt;
                &lt;/intent-filter&gt;
            &lt;/activity&gt;
        &lt;/application&gt;

    	&lt;uses-permission android:name=&quot;android.permission.INTERNET&quot; /&gt;

    &lt;/manifest&gt;

Any help is much appreciated, without solving this problem I can&#39;t test my app out!


Android app unable to start activity componentinfo

I&#39;m packaging a Java library as a JAR, and it&#39;s throwing many `java.lang.IncompatibleClassChangeError`s when I try to invoke methods from it. These errors seem to appear at random. What kinds of problems could be causing this error?

What causes java.lang.IncompatibleClassChangeError?

I have updated my emulator version and Android SDK version to Android S ([Android 12][1]). After the update, I cannot run the project. I cannot run a *[Hello, World!][2]* project (empty project), but I can build Gradle as well as, but I can not run the project. I always got the error:

&gt; Manifest merger failed: Apps targeting Android 12 and higher are
&gt; required to specify an explicit value for `android: exported` when the
&gt; corresponding component has an intent filter defined. See
&gt; https://developer.android.com/guide/topics/manifest/activity-element#exported
&gt; for details.

How can I fix it?

Here is a screenshot:

[![This is a screenshot.][3]][3]

How can I solve this issue when using Android 12 SDK?

[This question][4] is about the issue after applying the solution to this, and is different than this question. Also, this question is older than [this][4].


  [1]: https://en.wikipedia.org/wiki/Android_12
  [2]: https://en.wikipedia.org/wiki/%22Hello,_World!%22_program
  [3]: https://i.stack.imgur.com/ZMzmN.png
  [4]: https://stackoverflow.com/questions/67654506/manifest-merger-failed-targeting-android-12





Android Studio error: &quot;Manifest merger failed: Apps targeting Android 12&quot;

If you program for a nontechnical audience, you find yourself at a high risk that users will not read your carefully worded and enlightening error messages, but just click on the first button available with a shrug of frustration.

So, I&#39;m wondering what good practices you can recommend to help users actually read your error message, instead of simply waiving it aside. Ideas I can think of would fall along the lines of:

 - Formatting of course help; maybe a simple, short message, with a &quot;learn more&quot; button that leads to the longer, more detailed error message
 - Have all error messages link to some section of the user guide (somewhat difficult to achieve)
 - Just don&#39;t issue error messages, simply refuse to perform the task (a somewhat &quot;Apple&quot; way of handling user input)

*Edit:* the audience I have in mind is a rather broad user base that doesn&#39;t use the software too often and is not captive (i.e., no in-house software or narrow community). A more generic form of this question was asked on [slashdot][1], so you may want to [check there][2] for some of the answers.

  [1]: http://slashdot.org/
  [2]: http://ask.slashdot.org/story/10/03/01/132219/How-Do-You-Get-Users-To-Read-Error-Messages

How to get users to read error messages?

Does anyone have a `T_PAAMAYIM_NEKUDOTAYIM`?

PHP expects T_PAAMAYIM_NEKUDOTAYIM?

I was just testing an example from *Numerical Methods in Engineering with Python*.

    from numpy import zeros, array
    from math import sin, log
    from newtonRaphson2 import *
    
    def f(x):
    	f = zeros(len(x))
    	f[0] = sin(x[0]) + x[1]**2 + log(x[2]) - 7.0
    	f[1] = 3.0*x[0] + 2.0**x[1] - x[2]**3 + 1.0
    	f[2] = x[0] + x[1] + x[2] -5.0
    	return f
    	
    x = array([1.0, 1.0, 1.0])
    print newtonRaphson2(f,x)

When I run it, it shows the following error:

    File &quot;example NR2method.py&quot;, line 8, in f
        f[0] = sin(x[0]) + x[1]**2 + log(x[2]) - 7.0
    ValueError: math domain error

I have narrowed it down to the log as when I remove log and add a different function, it works. I assume it is because of some sort of interference with the base, I can&#39;t figure out how. Can anyone suggest a solution?

ValueError: math domain error

We have an application written against .NET 4.0 which over the weekend crashed, putting the following message into the event log:

&gt; Application: PnrRetrieverService.exe   Framework Version: v4.0.30319  
&gt; Description: The process was terminated due to an internal error in
&gt; the .NET Runtime at IP 791F9AAA (79140000) with exit code 80131506.

This is on a Windows Server 2003 R2 Standard Edition box.  Googling this error hasn&#39;t turned up anything pertinent.  For example, this isn&#39;t occurring in VS Studio, but instead on a production box; when the service was eventually restarted, it experienced no further problems.

How does one go about diagnosing a bug in the .NET Runtime?


Application Crashes With &quot;Internal Error In The .NET Runtime&quot;

Trying to use Select2 and getting this error on multiple item input/text field:

    &quot;query function not defined for Select2 undefined error&quot;

&quot;query function not defined for Select2 undefined error&quot;

I know there are a lot of same questions already posted in stack-overflow and tried different solutions to avoid the run-time error but None of them are working for me.

**[![Error][1]][1]**


  [1]: https://i.stack.imgur.com/4YHvI.png

**Component and Html Code**

    export class TestComponent implements OnInit, AfterContentChecked {
        @Input() DataContext: any;
        @Input() Position: any;
        sampleViewModel: ISampleViewModel = { DataContext: : null, Position: null };
        constructor(private validationService: IValidationService, private modalService: NgbModal, private cdRef: ChangeDetectorRef) {
        }
    
        ngOnInit() {
    
        }
        ngAfterContentChecked() {
    
                debugger;
                this.sampleViewModel.DataContext = this.DataContext;
                this.sampleViewModel.Position = this.Position;
                   
        }


    &lt;div class=&quot;container-fluid sample-wrapper text-center&quot; [ngClass]=&quot;sampleViewModel.DataContext?.Style?.CustomCssClass +&#39; samplewidget-&#39;+ sampleViewModel.Position?.Columns + &#39;x&#39; + sampleViewModel.Position?.Rows&quot;&gt;
         //some other html here
    &lt;/div&gt;

*Please Note : This Component is loaded dynamically using DynamicComponentLoader*

After My trouble shooting I have identified couple of issues

First of all this child component is loaded dynamically by using DynamicComponentResolver and passing the input values like below

     ngAfterViewInit() {
        this.renderWidgetInsideWidgetContainer();
    
      }
    
    
      renderWidgetInsideWidgetContainer() {
        let component = this.storeFactory.getWidgetComponent(this.dataSource.ComponentName);
        let componentFactory = this._componentFactoryResolver.resolveComponentFactory(component);
        let viewContainerRef = this.widgetHost.viewContainerRef;
        viewContainerRef.clear();
        let componentRef = viewContainerRef.createComponent(componentFactory);
        debugger;
        (&lt;IDataBind&gt;componentRef.instance).WidgetDataContext = this.dataSource.DataContext;
        (&lt;IDataBind&gt;componentRef.instance).WidgetPosition = this.dataSource.Position;
      
      }

Even If I changed my child component html like below I am getting this same error.Just add a angular ngclass attribute


    &lt;div class=&quot;container-fluid ds-iconwidget-wrapper text-center&quot; [ngClass]=&quot;Sample&quot;&gt;
      
    &lt;/div&gt;

 My databinding and everything are working fine.Do I need to do anything on parent component?
I already tried all the lifecyle events in child component

ExpressionChangedAfterItHasBeenCheckedError: Expression has changed after it was checked. Previous value: &#39;undefined&#39;

I recently downloaded JDK 1.8.0.0_06 that comes bundled with NetBeans. I then got to find out that my JavaFx project, that I have been developing in Java 1.7 won&#39;t compile in Java 1.8, and so I stepped down my JDK to 1.7. Still I can&#39;t get it to work/ compile. I get this error:

	javac: invalid target release: 1.8
	Usage: javac &lt;options&gt; &lt;source files&gt;

I&#39;m really stuck and would greatly appreciate any help.

javac: invalid target release: 1.8

I don&#39;t understand why I&#39;m getting this error. I&#39;m using AsyncTask to run some processes in the background.

I have:

    protected void onPreExecute() 
    {
    	connectionProgressDialog = new ProgressDialog(SetPreference.this);
    	connectionProgressDialog.setCancelable(true);
    	connectionProgressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
    	connectionProgressDialog.setMessage(&quot;Connecting to site...&quot;);
    	connectionProgressDialog.show();
    	
    	downloadSpinnerProgressDialog = new ProgressDialog(SetPreference.this);
    	downloadSpinnerProgressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
    	downloadSpinnerProgressDialog.setMessage(&quot;Downloading wallpaper...&quot;);
    }

When I get into `doInBackground()` depending on a condition I:

    [...]    
    connectionProgressDialog.dismiss();
    downloadSpinnerProgressDialog.show();
    [...]

Whenever I try `downloadSpinnerProgressDialog.show()` I receive the error.

Any ideas guys?



Can&#39;t create handler inside thread that has not called Looper.prepare() inside AsyncTask for ProgressDialog

I am trying to run this code:

    import web
    
    urls = (
    	&#39;/&#39;, &#39;index&#39;
    )
    
    if __name__ == &quot;__main__&quot;:
        app = web.application(urls, globals())
        app.run()
But it gives me this error everytime

    C:\Users\aidke\Desktop&gt;python app.py
    Traceback (most recent call last):
      File &quot;C:\Users\aidke\AppData\Local\Programs\Python\Python37-32\lib\site-packages\web\utils.py&quot;, line 526, in take
        yield next(seq)
    StopIteration
    
    The above exception was the direct cause of the following exception:
    
    Traceback (most recent call last):
      File &quot;app.py&quot;, line 14, in &lt;module&gt;
        app = web.application(urls, globals())
      File &quot;C:\Users\aidke\AppData\Local\Programs\Python\Python37-32\lib\site-packages\web\application.py&quot;, line 62, in __init__
        self.init_mapping(mapping)
      File &quot;C:\Users\aidke\AppData\Local\Programs\Python\Python37-32\lib\site-packages\web\application.py&quot;, line 130, in init_mapping
        self.mapping = list(utils.group(mapping, 2))
      File &quot;C:\Users\aidke\AppData\Local\Programs\Python\Python37-32\lib\site-packages\web\utils.py&quot;, line 531, in group
        x = list(take(seq, size))
    RuntimeError: generator raised StopIteration

I tried someone else&#39;s code and the exact same thing happened.  Additionally I tried reinstalling web.py(experimental) but it still didn&#39;t work.

&quot;RuntimeError: generator raised StopIteration&quot; every time I try to run app

All I want to do is check if an object is null, but no matter what I do, if it compiles, it throws a `NullReferenceException` just trying to check! Here&#39;s what I&#39;ve done:


        If ((Not (comp.Container Is Nothing)) And (Not (comp.Container.Components Is Nothing))) Then
            For i As Integer = 0 To comp.Container.Components.Count() - 1 Step 1
                fixUIIn(comp.Container.Components.Item(i), style)
            Next
        End If

        If ((Not IsDBNull(comp.Container)) And (Not IsDBNull(comp.Container.Components))) Then
            For i As Integer = 0 To comp.Container.Components.Count() - 1 Step 1
                fixUIIn(comp.Container.Components.Item(i), style)
            Next
        End If

        If ((Not IsNothing(comp.Container)) And (Not IsNothing(comp.Container.Components))) Then
            For i As Integer = 0 To comp.Container.Components.Count() - 1 Step 1
                fixUIIn(comp.Container.Components.Item(i), style)
            Next
        End If

        If ((Not (comp.Container Is DBNull.Value)) And (Not (comp.Container.Components Is DBNull.Value))) Then
            For i As Integer = 0 To comp.Container.Components.Count() Step 1
                fixUIIn(comp.Container.Components.Item(i), style)
            Next
        End If

I&#39;ve looked through VB books, searched several forums, and everything that SHOULD work doesn&#39;t! Sorry for asking such a remedial question, but I just need to know.

Just so you know, the debugger says that the null object is `comp.Container`

Null check in VB

Under Linux, I&#39;ve been checking out matplotlib&#39;s animation class, and it seems to work except that I cant initialise the movie writer to write out the movie.

Using either of the examples:

 * &lt;http://matplotlib.org/examples/animation/moviewriter.html&gt;
 * &lt;http://matplotlib.org/examples/animation/basic_example_writer.html&gt;

results in the error &quot;**RuntimeError: No MovieWriters available!**&quot;

Im using matplotlib version 1.3.x and have installed (hopefully) all the codecs.

Can someone please suggest as to why I get this error? If its a codecs issue, which codecs (+versions) should I install?
If its something else that&#39;s broken, is there an alternative for creating animations in python?

Matplotlib-Animation &quot;No MovieWriters Available&quot;

**Symptoms:**

Git suddenly refused to push a repository (to github in my case):

    $ git push
    Counting objects: 9292, done.
    Delta compression using up to 8 threads.
    Compressing objects: 100% (2136/2136), done.
    error: RPC failed; result=22, HTTP code = 411
    fatal: The remote end hung up unexpectedly
    Writing objects: 100% (8222/8222), 1.27 MiB | 837 KiB/s, done.
    Total 8222 (delta 6060), reused 8181 (delta 6033)
    fatal: The remote end hung up unexpectedly
    Everything up-to-date



Git: error: RPC failed; result=22, HTTP code = 411

I got this error:

&gt;Thread 1:EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)

How can I solve this? The code works normally, but in the calculator when I click the only equal button, it gives that error.

    @IBAction func equals(sender: AnyObject) {
        
        secondNumber = Screen.text!.toInt()!  // here it shows an error which is &quot;Thread 1:EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)&quot;

        if operation == &quot;+&quot;{
            result = firstNumber + secondNumber
        }
        else if operation == &quot;-&quot; {
            result = firstNumber - secondNumber
        }
        else if operation == &quot;x&quot; {
            result = firstNumber * secondNumber
        }
        else {
            result = firstNumber / secondNumber
        }
        Screen.text = &quot;\(result)&quot;
    }


what does Error &quot;Thread 1:EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)&quot; mean?

While installing the android application in the emulator I am getting the following error.

Please help me to resolve this error.

Error message:

    emulator.exe -avd avd_name
    
    adb wait-for-device    
    
    adb install path-to.apk    
    
    could not access the package manager. is the system running while installing android application....



could not access the package manager. is the system running while installing android application

Any guess on &quot;Unable to boot device in current state: Booted&quot; error in Xcode6 beta while running (build+run) project in Simulator. I am just running my existing project in Xcode 6 I found above message. I tried cleaning, deleting of the derived data, even restarting the simulator doesn&#39;t work. Finally i restarted my Xcode 6 then it is working. Any simpler way to resolve the error instead of restarting your xcode6.

![Screenshot for error][1]


  [1]: http://i.stack.imgur.com/orcuJ.png

Unable to boot device in current state: Booted

&lt;!-- language-all: lang-none --&gt;

New Java programmers often encounter messages like the following when they attempt to run a Java program.  (Different Java tools, IDEs and so on give a variety of diagnostics for this problem.)

----

    Error: Main method not found in class MyClass, please define the main method as:
       public static void main(String[] args)
    or a JavaFX application class must extend javafx.application.Application

----

    Error: Main method not found in the file, please define the main method as: 
       public static void main(String[] args)

----

    Error: Main method is not static in class MyClass, please define the main method as:
       public static void main(String[] args)

----

    Error: Main method must return a value of type void in class MyClass, please
    define the main method as:
       public static void main(String[] args)

----

    java.lang.NoSuchMethodError: main
    Exception in thread &quot;main&quot;

----

What does this mean, what can cause it, and what should one do to fix it?

&quot;Error: Main method not found in class MyClass, please define the main method as...&quot;

When I executing the following code: 

    public static void main(String[] args) {
		try {
		    FirefoxDriver driver = new FirefoxDriver();
		    driver.get(&quot;http:www.yahoo.com&quot;);
        } catch (NoClassDefFoundError ex) {
            System.out.println(&quot;error: &quot; + ex.getStackTrace());
		}
	}

I&#39;m facing the following error: 

&gt;error:[Ljava.lang.StackTraceElement;@80f4cb
&gt;
&gt;Exception in thread &quot;main&quot; java.lang.NoClassDefFoundError: com/google/common/base/Function

&lt;br&gt;
Could someone help me to find the solution or reason for this?

All Runtime Error Solutions on Gang of Coders

Total of 22 Runtime Error Solutions

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Android app unable to start activity componentinfo

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Android Studio error: "Manifest merger failed: Apps targeting Android 12"

How to get users to read error messages?

PHP expects T_PAAMAYIM_NEKUDOTAYIM?

ValueError: math domain error

Application Crashes With "Internal Error In The .NET Runtime"

"query function not defined for Select2 undefined error"

ExpressionChangedAfterItHasBeenCheckedError: Expression has changed after it was checked. Previous value: 'undefined'

javac: invalid target release: 1.8

Can't create handler inside thread that has not called Looper.prepare() inside AsyncTask for ProgressDialog

"RuntimeError: generator raised StopIteration" every time I try to run app

Null check in VB

Matplotlib-Animation "No MovieWriters Available"

Git: error: RPC failed; result=22, HTTP code = 411

what does Error "Thread 1:EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)" mean?

could not access the package manager. is the system running while installing android application

Unable to boot device in current state: Booted

"Error: Main method not found in class MyClass, please define the main method as..."

NoClassDefFoundError in Java: com/google/common/base/Function