How to resolve “Target of URI hasn’t been generated: ‘package:ecommerce/pages/signup/notifier/register_notifier.g.dart’.”

I encountered this error and I decided to show how I resolved it in order to help someone

First step: you have to run “flutter pub add build_runner”.

Second step: you have to run “dart run build_runner build — delete-conflicting-outputs”

Third step: this is very important, make sure that your part name is the same as your file name for example

If your file name is “register_notifier.dart” then your part should be “register _notifier.g.dart”.

I hope this helps someone ❤️