…/My_SDK/flutter/.pub-cache/hosted/pub.flutter-io.cn/lottie-1.2.2/lib/src/lottie.dart:48:5: Error: Type ‘AssetBundle’ not found.
AssetBundle? bundle,
^^^^^^^^^^^
…/My_SDK/flutter/.pub-cache/hosted/pub.flutter-io.cn/lottie-1.2.2/lib/src/lottie_builder.dart:137:5: Error: Type ‘AssetBundle’ not found.
AssetBundle? bundle,
^^^^^^^^^^^
…/My_SDK/flutter/.pub-cache/hosted/pub.flutter-io.cn/lottie-1.2.2/lib/src/lottie.dart:48:5: Error: ‘AssetBundle’ isn’t a type.
AssetBundle? bundle,
^^^^^^^^^^^
…/My_SDK/flutter/.pub-cache/hosted/pub.flutter-io.cn/lottie-1.2.2/lib/src/lottie_builder.dart:137:5: Error: ‘AssetBundle’ isn’t a type.
AssetBundle? bundle,
^^^^^^^^^^^

FAILURE: Build failed with an exception.

• Where:
  Script ‘D:\cjl\MyProject\javaProject\My_SDK\flutter\packages\flutter_tools\gradle\flutter.gradle’ line: 1035

• What went wrong:
  Execution failed for task ‘:app:compileFlutterBuildDebug’.

Process ‘command ‘D:\cjl\MyProject\javaProject\My_SDK\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 19s
Exception: Gradle task assembleDebug failed with exit code 1

老师，这是属于flutter版本问题吗？