NULL安全应用程序在Flutter 3.0上不可运行
我有一个Flutter应用程序，它在Flutter 3.0上正常运行，但是在迁移到Null安全后，我在尝试运行时收到了此功能：
FAILURE: Build failed with an exception.
* Where:
Script 'C:\apps\flutter\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 1156
* What went wrong:
Execution failed for task ':app:compileFlutterBuildDebug'.
> Process 'command 'C:\apps\flutter\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 29s
Exception: Gradle task assembleDebug failed with exit code 1
I've a Flutter app, that was running properly on Flutter 3.0, but after migrating to Null Safety, I receive this while trying to run:
FAILURE: Build failed with an exception.
* Where:
Script 'C:\apps\flutter\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 1156
* What went wrong:
Execution failed for task ':app:compileFlutterBuildDebug'.
> Process 'command 'C:\apps\flutter\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 29s
Exception: Gradle task assembleDebug failed with exit code 1
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转到pubspec.yaml文件，尝试执行软件包获取|酒吧获取，然后再次构建项目。
Go to pubspec.yaml file, try doing Packages get | Pub get, and then build the project again.