'Mockito flutter error: Cannot retrieve modification time

To prepare mockito Mocks for test, my use case:

import 'package:mockito/annotations.dart';
import 'package:.../repositories/random_activity_repository.dart';

@GenerateMocks([RandomActivityRepository])
void main() {}

When I build with: flutter packages pub run build_runner Something goes wrong, and for every file I have, I get:

FileSystemException(path:...dart, message=Cannot retrieve modification time) [SEVERE]

I am tired of reading the docs (here: https://pub.dev/packages/mockito and here: https://github.com/mockito/mockito) but I cannot find this kind of error.

Can somebody help me UNDERSTAND what's going on?



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