Updated to Android Studio 3.0. Getting a "Kotlin not configured" error

Android Problem Overview

I just updated to Android Studio 3.0 and I'm getting this error with an existing project:

> Kotlin not configured

When I go to Tools>Kotlin>Configure Kotlin in Project, I get an error saying "no configurators available". Also get the error below with the red java:

I've also tried:

Restarting
Clean and Rebuild
Invalidate caches/restart.

Android Solutions

Solution 1 - Android

I first tried with invalidate cache/ restart option but it doesn't help me.

When I updated Kotlin to 1.1.60 in project's gradle file, problem is solved.

Also, use this in app's gradle for stdlib

implementation "org.jetbrains.kotlin:kotlin-stdlib:1.1.60"

instead of

implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:1.1.60"

Solution 2 - Android

In Android Studio, click on File -> Invalidate Caches / Restart... , then select "Invalidated and Restart". This solved my problem.

Solution 3 - Android

This error also occurs if you have the mavenCentral() repository missing in allprojects. Your build.gradle (:app) should contain at least this:

allprojects {
    repositories {
        google()
        mavenCentral()
    }
}

jcenter() would work as well (for now), but that repository reached end-of-life and shouldn't be used any more.

Solution 4 - Android

Closing and restarting Android Studio works for me in that case. Important is that there are no other projects opened in Android Studio before you close it. I suspect that closing Android Studio with multiple opened project windows sometimes messes up the configuration especially after plugin upgrades etc.

Solution 5 - Android

The only thing that worked for me was to uninstall the kotlin plugin (File -> Settings -> Plugins -> Kotlin press uninstall) and after a restart of Android Studio reinstall the plugin.

Solution 6 - Android

#Important Update

###You should check JDK version before setting config

Kotlin gradle config page has detailed information about this.

##Step 1

Check kotlin version in project level gradle file.

> classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" > > ## For kotlin_version '1.2.x' Use jdk NOT jre

##Step 2

Check JDK version in File > Project Structure

Or check in build.gradle

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}

If no JDK version is set in Project Structure, then choose by Android Studio version

JDK version is 1.7 for Android Studio Version < 2.2.1
JDK version is 1.8 for Android Studio Version < 2.2.1

Because Android Studio is bundled with jdk 1.8 since 2.2.1 version.

You have 3 options of kotlin stdlib, choose according JDK version

implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version" //jdk_version == 1.8
implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version" //jdk_version == 1.7
implementation"org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" // jdk_version is < 1.7

> ## if kotlin version is'1.1.x' Use jre NOT jdk

implementation"org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version" // or jre8

###Update Kotlin Version?

You can update Kotlin version from Tools > Kotlin > Configure Kotlin Updates

Solution 7 - Android

Kotlin-stdlib-jre7 is deprecated since 1.2.0 and should be replaced with kotlin-stdlib-jdk7

implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"

Solution 8 - Android

I have faced this issue recently... when I updated to Android Studio 3.1 .

I did a few things to fix this.

First I updated the Kotlin version in my app gradle file and added
```
implementation "org.jetbrains.kotlin:kotlin-stdlib:1.2.31" 
```
in my app gradle file. But this alone didn't fix it.
Then uninstalled the kotlin plugin from settings, restarted Android Studio and installed it again.

EDIT :

This is my project gradle file

buildscript {
   ext.kotlin_version = '1.2.31'
   repositories {
      jcenter()
      google()
    }
   dependencies {
      classpath 'com.android.tools.build:gradle:3.1.1'
      classpath 'com.google.gms:google-services:3.1.0'
      classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.2.31"

   }
 }

allprojects {
   repositories {
      jcenter()
      maven { url "https://jitpack.io" }
      google()
   }
}

And this is my app gradle file

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'

android {

   compileSdkVersion 27

   buildToolsVersion '27.0.3'

   defaultConfig {
       ...
    }

    buildTypes {
        ...
    }

    sourceSets {
         main.java.srcDirs += 'src/main/kotlin'
     }

     kapt { generateStubs = true }


}
repositories {
     ...
}


dependencies {
    ...
    ...
    implementation "org.jetbrains.kotlin:kotlin-stdlib:1.2.31"
    ...
    ...

 }

apply plugin: 'com.google.gms.google-services'

Solution 9 - Android

A common reason of the "Kotlin Not Configured" message is an internal Android Studio exception due to a bad plugin. In order to fix that you should disable the bad plugin.

When such plugin crash occurs, on the "Wellcome screen" you'll see a small notification (see illustration image) where you can click it and disable the bad plugin:

Solution 10 - Android

None of the other solutions solved my problem. I ended up figuring out that the problem lied in the google services version. Just update it to the latest.

Top level gradle at dependencies:

classpath 'com.google.gms:google-services:4.1.0'

Solution 11 - Android

In my case, after the update of Android Studio and plugins, I could create new projects, but my old projects were having "Gradle Sync Issues".

The solution was in File/Project Structure.../App/Dependencies:

implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"

And then I just updated the Kotlin version in my project build.gradle:

From:

>ext.kotlin_version = '1.2.30'

To:

>ext.kotlin_version = '1.3.21'

Then I tried Sync again.

Obs: You can check your Kotlin version in Tools/Kotlin/Configure Kotlin Plugin Updates

Solution 12 - Android

I have tried all above solutions but non of them works for me.

Then finally I got success with below solution, so it may helpful for some one like me.

Delele all .iml files (in root project, libraries and modules)
Rebuild project

Solution 13 - Android

In my case I had to update Android studio from version 3.4.1. to 3.5 and it resolved the kotlin not configured error.

Solution 14 - Android

Delete .AndroidStudio3.6 folder in C:\Users\Username and re-open Android studio works for me

Solution 15 - Android

The only fix for me was adding

apply plugin: 'kotlin-android-extensions'

in build.gradle (:app)

Solution 16 - Android

just delete .idea folder from project,and run android studio again, it will resolve KOTLIN NOT CONFIGURED issue.

Solution 17 - Android

One other point to check is version of your Gradle in gradle-wrapper.properties, if you use one.

Make sure that distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip

Has version 4.1 or higher.

You may also have the following in your build.gradle:

task wrapper(type: Wrapper) {
    gradleVersion = '4.1'
    distributionUrl = "https://services.gradle.org/distributions/gradle-$gradleVersion-all.zip"
}

Where Gradle version is lower that 4.1

Solution 18 - Android

Though I see that the question already has answers that work, one might also try the following solution.

Right click on the file name (Main.kt) -> Run 'Main.kt'.

This will download a gradle file from the gradle.org website.

Wait for it to unzip. The errors were cleared.

Solution 19 - Android

In my case, it was a broken update of one of the plugins I've used. Check your error logs from Android Studio this will lead you to what is the problem.

Solution 20 - Android

Simply Create a new Activity and select its language to kotlin Android studio Automatically configured kotlin for you.

Content Type	Original Author	Original Content on Stackoverflow
Question	Ryan Lertola	View Question on Stackoverflow
Solution 1 - Android	Mladen Rakonjac	View Answer on Stackoverflow
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