Angular2 : Can't bind to 'formGroup' since it isn't a known property of 'form'

I think that this is an old error that you tried to fix by importing random things in your module and now the code does not compile anymore. while you don't pay attention to the shell output, the browser reload, and you still get the same error.

Your module should be :

@NgModule({
  imports: [
    CommonModule,
    FormsModule,
    ReactiveFormsModule
  ],
  declarations: [
    ContactComponent
  ]
})
export class ContactModule {}

try with

<form formGroup="userForm">

instead of

<form [formGroup]="userForm">

Try to add ReactiveFormsModule in your component as well.

import { FormGroup, FormArray, FormBuilder,
          Validators,ReactiveFormsModule  } from '@angular/forms';