Error: Null safety features are disabled for this library. Try removing the package language version-CodePudding

Building without sound null safety
For more information see https://dart.dev/null-safety/unsound-null-safety

lib/main.dart:8:19: Error: Null safety features are disabled for this library.
Try removing the package language version or setting the language version to 2.12 or higher.
  const MyApp({Key? key}) : super(key: key);
                  ^
lib/main.dart:33:24: Error: Null safety features are disabled for this library.
Try removing the package language version or setting the language version to 2.12 or higher.
  const MyHomePage({Key? key, required this.title}) : super(key: key);
                       ^
lib/main.dart:33:31: Error: 'required' isn't a type.
  const MyHomePage({Key? key, required this.title}) : super(key: key);
                              ^^^^^^^^
../../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/meta-1.7.0/lib/meta.dart:260:16: Context: This isn't a type.
const Required required = Required();
               ^^^^^^^^


FAILURE: Build failed with an exception.

* Where:
Script 'C:\src\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 1156

* What went wrong:
Execution failed for task ':app:compileFlutterBuildRelease'.
> Process 'command 'C:\src\flutter\bin\flutter.bat'' finished with non-zero exit value 1

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 16s
Running Gradle task 'assembleRelease'...                           18.0s
Gradle task assembleRelease failed with exit code 1

CodePudding user response：

are you using any plugin that do not uses null safety. If so, try updating the plugin.

CodePudding user response：

Try this command in terminal for building

flutter run --no-sound-null-safety