HTML : Angular 4 Can't bind to 'formGroup' since it isn't a known property of 'form'

HTML : Angular 4 Can't bind to 'formGroup' since it isn't a known property of 'form'
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HTML : Angular 4 Can't bind to 'formGroup' since it isn't a known property of 'form'
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since to 'formGroup' isn't HTML it known of Can't bind property 4 'form' : a Angular