问当我尝试构建APK时，在调试控制台中显示以下内容。生成:生成失败，出现异常

EN

/C:/src/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_日期时间_选择器-1.3.8/lib/src/datetime_拾取器_theme.dart:6:28:错误:找不到类型'DiagnosticableMixin‘。使用/C:/src/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/flutter {^^ DatePickerTheme DiagnosticableMixin {^^^_svg-0.17.4/lib/src/图片_stream.dart:88:26:错误:找不到型'DiagnosticableMixin‘。使用/C:/src/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/flutter {^^ PictureStream DiagnosticableMixin {^^^_svg-0.17.4/lib/src/图片_stream.dart:192:44:错误:找不到类型'DiagnosticableMixin‘。使用/C:/src/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/flutter {^使用DiagnosticableMixin {^^的抽象类PictureStreamCompleter_日期时间_选择器-1.3.8/lib/src/datetime_拾取器_theme.dart:6:7:错误:不能混合使用类型“DiagnosticableMixin”。使用/C:/src/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/flutter {^ DatePickerTheme }创建DiagnosticableMixin类_svg-0.17.4/lib/src/图片_stream.dart:88:7:错误:不能混合使用类型“DiagnosticableMixin”。使用/C:/src/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/flutter {^ PictureStream }创建DiagnosticableMixin类_svg-0.17.4/lib/src/图片_stream.dart:192:16:错误:不能混合使用类型“DiagnosticableMixin”。使用/C:/src/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/flutter {^ PictureStreamCompleter }抽象类DiagnosticableMixin_svg-0.17.4/lib/src/图片_stream.dart:167:11:错误:超类没有名为“debugFillProperties”的方法。/C:/src/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/flutter (属性)；super.debugFillProperties(属性)；^^_svg-0.17.4/lib/src/图片_stream.dart:171:30:错误:没有为“”PictureStreamCompleter“类定义方法“”toStringShort“”。“”

• 'PictureStreamCompleter‘来自'package:flutter’_svg/src/图片_Stream.dart的('/C:/src/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_svg-0.17.4/lib/src/图片_stream.dart')。请尝试将名称更正为现有方法的名称，或定义名为“toStringShort”的方法。ifPresent：_/C:/src/flutter/flutter/.pub-cache/hosted/pub.dartlang.org/flutter ()completer?.toStringShort()，^^_svg-0.17.4/lib/src/图片_stream.dart:266:11:错误:超类没有名为“debugFillProperties”的方法。Super.debugFillProperties(描述)；^^

失败:生成失败，出现异常。

• 其中: Script 'C:\src\flutter\flutter\packages\flutter_tools\gradle\flutter.gradle‘线路: 896
• 出错之处:执行任务':app:compileFlutterBuildDebug‘失败。

进程'command 'C:\src\flutter\flutter\bin\flutter.bat'‘已完成，退出值为1

• 尝试:使用--stacktrace选项运行以获取堆栈跟踪。使用--info或--debug选项运行以获取更多日志输出。运行--scan以获得完整的洞察。
• 要获得更多帮助，请访问https://help.gradle.org
• 在1m 12s异常中生成失败: Gradle任务assembleDebug失败，退出代码%1已退出(sigterm)