Error: Cannot run with sound null safety, because the following dependencies don't support null safety

Question

HOPE YOU GO VERY WELL !!

I'm currently working on a control pad pannel for a robot control i'm working for the flutter mobile part so than i'm facing this error :

Error: Cannot run with sound null safety, because the following dependencies don't support null safety:

• package:control_pad

For solutions, see https://dart.dev/go/unsound-null-safety lib/main.dart:77:5: Warning: Operand of null-aware operation '?.' has type 'StreamSubscription' w hich excludes null.

• 'StreamSubscription' is from 'dart:async'.
• 'ScanResult' is from 'package:flutter_blue/flutter_blue.dart' ('../../AppData/Local/Pub/Cache/hosted/pub.d

FAILURE: Build failed with an exception. flutter error screenshot

i really need your help

Thanks!

Answer 1

To run your project with --no-sound-null-safety add this line your main.dart file in top(first line) with comment..

// @dart=2.9

then run your project.

To read more : Reference

Answer 2

try this solution on Android Studio

1. GO Run-> Edit Configurations.
2. Add on this line to Additional Run args

--no-sound-null-safety

3. APPLY
4. OK

enter image description here