出師未捷身先死：

Installing ../../flutter/myapp/build/app/outputs/apk/app.apk...

E/flutter ( 3378): [ERROR:flutter/shell/common/shell.cc(178)] Dart Error: Unhandled exception:

E/flutter ( 3378): 'dart:ui/window.dart': Failed assertion: line 306: '<optimized out>': is not true.

E/flutter ( 3378): #0? ? ? _AssertionError._doThrowNew (dart:core-patch/errors_patch.dart:40:39)

E/flutter ( 3378): #1? ? ? _AssertionError._throwNew (dart:core-patch/errors_patch.dart:36:5)

E/flutter ( 3378): #2? ? ? new Locale.fromSubtags (dart:ui/window.dart:306:15)

E/flutter ( 3378): #3? ? ? _updateLocales (dart:ui/hooks.dart:89:43)

Syncing files to device Android SDK built for x86...

I/flutter ( 3378): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════

I/flutter ( 3378): The following NoSuchMethodError was thrown building ScrollConfiguration(behavior:

I/flutter ( 3378): _MaterialScrollBehavior):

I/flutter ( 3378): The getter 'languageCode' was called on null.

I/flutter ( 3378): Receiver: null

I/flutter ( 3378): Tried calling: languageCode

初始化項目，啟動時報這個錯誤，不知道有沒有遇到的，如何解決？