formGroup expects a FormGroup instance

Angular Angular2 Forms Angular2 Formbuilder

Angular Problem Overview

I have an Angular 2 RC4 basic form example on Plunkr that appears to throw the following error (In Chrome DEV console)

Here's the plunkr

Error:

browser_adapter.ts:82 EXCEPTION: Error: Uncaught (in promise): EXCEPTION: Error in ./App class App - inline template:1:7
ORIGINAL EXCEPTION: formGroup expects a FormGroup instance. Please pass one in.
           Example: <form [formGroup]="myFormGroup">
      
ORIGINAL STACKTRACE:
Error: formGroup expects a FormGroup instance. Please pass one in.
           Example: <form [formGroup]="myFormGroup">
      
    at new BaseException (https://npmcdn.com/@angular/forms@0.2.0/src/facade/exceptions.js:27:23)
    at FormGroupDirective._checkFormPresent (https://npmcdn.com/@angular/forms@0.2.0/src/directives/reactive_directives/form_group_directive.js:110:19)
    at FormGroupDirective.ngOnChanges (https://npmcdn.com/@angular/forms@0.2.0/src/directives/reactive_directives/form_group_directive.js:39:14)
    at DebugAppView._View_App0.detectChangesInter

Angular Solutions

Solution 1 - Angular

There are a few issues in your code

<div [formGroup]="form"> outside of a <form> tag
<form [formGroup]="form"> but the name of the property containing the FormGroup is loginForm therefore it should be <form [formGroup]="loginForm">
[formControlName]="dob" which passes the value of the property dob which doesn't exist. What you need is to pass the string dob like [formControlName]="'dob'" or simpler formControlName="dob"

Plunker example

Solution 2 - Angular

I was facing this issue and fixed by putting a check in form attribute. This issue can happen when the FormGroup is not initialized.

<form [formGroup]="loginForm" *ngIf="loginForm">
OR
<form [formGroup]="loginForm" *ngIf="this.loginForm">

This will not render the form until it is initialized.

Solution 3 - Angular

I was using reactive forms and ran into similar problems. What helped me was to make sure that I set up a corresponding FormGroup in the class. Something like this:

myFormGroup: FormGroup = this.builder.group({
    dob: ['', Validators.required]
});

Solution 4 - Angular

I had a the same error and solved it after moving initialization of formBuilder from ngOnInit to constructor.

Solution 5 - Angular

I had this error when I had specified fromGroupName instead of formArrayName.

Make sure you correctly specify if it is a form array or form group.

<div formGroupName="formInfo"/>

<div formArrayName="formInfo"/>

Solution 6 - Angular

I had the same error and I solvit removing the async await pattern from it:
orginal code

async ngOnInit()
{
  this.id = await this.route.snapshot.paramMap.get('id');

working code

ngOnInit()
{
  this.id = this.route.snapshot.paramMap.get('id');

I think might be related to @johannesMatevosyan answer just above. I really don't know why, but is working for me.

Content Type	Original Author	Original Content on Stackoverflow
Question	user6123723	View Question on Stackoverflow
Solution 1 - Angular	Günter Zöchbauer	View Answer on Stackoverflow
Solution 2 - Angular	Shakoor Hussain Attari	View Answer on Stackoverflow
Solution 3 - Angular	Patrick	View Answer on Stackoverflow
Solution 4 - Angular	johannesMatevosyan	View Answer on Stackoverflow
Solution 5 - Angular	Tom Benyon	View Answer on Stackoverflow
Solution 6 - Angular	Martin	View Answer on Stackoverflow