Angular 2 Cannot find control with unspecified name attribute on formArrays

The problem for me was that I had

[formControlName]=""

Instead of

formControlName=""

In my case I solved the issue by putting the name of the formControl in double and sinlge quotes so that it is interpreted as a string:

[formControlName]="'familyName'"

similar to below:

formControlName="familyName"

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.