Hi Rakhee, You are running into trouble because you are mixing up reactive and template driven forms. Stick with one. What happens is that you define a single formgroup, and you are trying to reuse this for every 'line' in your form. But as it's only a single instance, you keep on overwriting the previous one, while the ngFor add's the members. That is causing the ExpressionChangeAfterItHasBeenCheckedError.
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