Dart DevTools exited with code 1

Flutter 1.9.1+hotfix.4 • channel unknown • unknown source
Framework • revision cc949a8e8b (8 months ago) • 2019-09-27 15:04:59 -0700
Engine • revision b863200c37
Tools • Dart 2.5.0

dart plugin: 3.10.2
flutter plugin: 3.10.2