check if keystore file exists before trying to sign
just set up the development environment to test your app but if you don't have the keystore it won't compile. For fixing this I added a small check if the keystore file exist before trying to sign.
Btw another error is shown when trying to compile:
lib/screens/workout_editor.dart:299:64: Error: The argument type 'DragItem<WorkoutExercise>' can't be assigned to the parameter type 'WorkoutExercise'.
- 'DragItem' is from 'package:drag_list/src/drag_list.dart' ('../../snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/drag_list-1.0.8/lib/src/drag_list.dart').
- 'WorkoutExercise' is from 'package:feeel/models/workout_exercise.dart' ('lib/models/workout_exercise.dart').
workoutExercise: item,
As I am new in dart and flutter, I can't fix it at the moment but when I comment it out, it works.