Angular 2 Cannot find control with unspecified name attribute on formArrays

Remove the brackets from

[formArrayName]="areas"

and use only

formArrayName="areas"

This, because with [ ] you are trying to bind a variable, which this is not. Also notice your submit, it should be:

(ngSubmit)="onSubmit(areasForm.value)"

instead of areasForm.values.

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