angular - Can't bind to 'formGroup' since it isn't a known property of 'form' - Stack Overflow

The situation I am trying to make what should be a very simple form in my Angular application, but no matter what, it never works. The Angular version Angular 2.0.0 RC5 The error Can't bind to '

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angular - Can't bind to 'formGroup' since it isn't a known

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error NG8002: Can't bind to 'formGroup' since it isn't a known property of ' form'. · Issue #45352 · angular/angular · GitHub

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NG8002: Can't bind to 'formGroup' since it isn't a known property of 'form

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angular 9 Can't bind to 'formGroup' since it isn't a known property of 'form' · Issue #36080 · angular/angular · GitHub