1. 升级flutter
出了问题
【Try removing the package language version or setting the language version to 2.10 or higher.
】
dart "/Users/gitartos/Desktop/flutter_projects/flutter_app/lib/main.dart"
flutter_app/lib/main.dart: Warning: Interpreting this as package URI, 'package:flutterapp/main.dart'.
../../opt/flutter/packages/flutter/lib/src/material/about.dart:123:8: Error: Null safety features are disabled for this library.
Try removing the package language version or setting the language version to 2.10 or higher.
Key? key,
^
../../opt/flutter/packages/flutter/lib/src/material/about.dart:140:15: Error: Null safety features are disabled for this library.
Try removing the package language version or setting the language version to 2.10 or higher.
final Widget? icon;
^
../../opt/flutter/packages/flutter/lib/src/material/about.dart:146:15: Error: Null safety features are disabled for this library.
Try removing the package language version or setting the language version to 2.10 or higher.
final Widget? child;
^
../../opt/flutter/packages/flutter/lib/src/material/about.dart:155:15: Error: Null safety features are disabled for this library.
Try removing the package language version or setting the language version to 2.10 or higher.
final String? applicationName;
^
../../opt/flutter/packages/flutter/lib/src/material/about.dart:162:15: Error: Null safety features are disabled for this library.
Try removing the package language version or setting the language version to 2.10 or higher.
final String? applicationVersion;
^
../../opt/flutter/packages/flutter/lib/src/material/about.dart:173:15: Error: Null safety features are disabled for this library.
Try removing the package language version or setting the language version to 2.10 or higher.
final Widget? applicationIcon;
^
../../opt/flutter/packages/flutter/lib/src/material/about.dart:180:15: Error: Null safety features are disabled for this library.
Try removing the package language version or setting the language version to 2.10 or higher.
final String? applicationLegalese;
^
../../opt/flutter/packages/flutter/lib/src/material/about.dart:188:21: Error: Null safety features are disabled for this library.
Try removing the package language version or setting the language version to 2.10 or higher.
final List<Widget>? aboutBoxChildren;
^
../../opt/flutter/packages/flutter/lib/src/material/about.dart:195:13: Error: Null safety features are disabled for this library.
Try removing the package language version or setting the language version to 2.10 or higher.
final bool? dense;
^
../../opt/flutter/packages/flutter/lib/src/material/about.dart:238:3: Error: Null safety features are disabled for this library.
Try removing the package language version or setting the language version to 2.10 or higher.
required BuildContext context,
^^^^^^^^
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