In plugin 'FlutterPlugin' type 'FlutterTask' property 'assets' is missing an input or output annotation.

FAILURE: Build failed with an exception.

* What went wrong:
Some problems were found with the configuration of task ':app:compileFlutterBuildDebug' (type 'FlutterTask').
  - In plugin 'FlutterPlugin' type 'FlutterTask' property 'assets' is missing an input or output annotation.

    Reason: A property without annotation isn't considered during up-to-date checking.

    Possible solutions:
      1. Add an input or output annotation.
      2. Mark it as @Internal.

    Please refer to https://docs.gradle.org/7.4/userguide/validation_problems.html#missing_annotation for more details about this problem.
  - In plugin 'FlutterPlugin' type 'FlutterTask' property 'assetsDirectory' is missing an input or output annotation.

    Reason: A property without annotation isn't considered during up-to-date checking.

    Possible solutions:
      1. Add an input or output annotation.
      2. Mark it as @Internal.

    Please refer to https://docs.gradle.org/7.4/userguide/validation_problems.html#missing_annotation for more details about this problem.
  - In plugin 'FlutterPlugin' type 'FlutterTask' property 'buildMode' is missing an input or output annotation.

    Reason: A property without annotation isn't considered during up-to-date checking.

    Possible solutions:
      1. Add an input or output annotation.
      2. Mark it as @Internal.

    Please refer to https://docs.gradle.org/7.4/userguide/validation_problems.html#missing_annotation for more details about this problem.
  - In plugin 'FlutterPlugin' type 'FlutterTask' property 'fastStart' doesn't have a configured value.

    Reason: This property isn't marked as optional and no value has been configured.

    Possible solutions:
      1. Assign a value to 'fastStart'.
      2. Mark property 'fastStart' as optional.

    Please refer to https://docs.gradle.org/7.4/userguide/validation_problems.html#value_not_set for more details about this problem.
  - In plugin 'FlutterPlugin' type 'FlutterTask' property 'flutterExecutable' is missing an input or output annotation.

    Reason: A property without annotation isn't considered during up-to-date checking.

    Possible solutions:
      1. Add an input or output annotation.
      2. Mark it as @Internal.

    Please refer to https://docs.gradle.org/7.4/userguide/validation_problems.html#missing_annotation for more details about this problem.

* 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

解決方式

發生這種情況是因為您項目中的 gradle/wrapper/gradle-wrapper.properties 的 gdistributionUrl 版本為 gradle 7 以上
1.降級你的 gradle 版本( 小於 7 )
2.到flutter sdk 資料夾下，按照此方式進行更改。