您好，我在学习flutter参考您的项目，项目写的挺好的，大大点赞
有遇到问题，xcode编译中中发下一个错误
`
../../../../../../.pub-cache/hosted/pub.flutter-io.cn/flutter_svg-0.17.2/lib/src/picture_stream.dart:88:26: Error: Type 'DiagnosticableMixin' not found.
class PictureStream with DiagnosticableMixin {
^^^^^^^^^^^^^^^^^^^
../../../../../../.pub-cache/hosted/pub.flutter-io.cn/flutter_svg-0.17.2/lib/src/picture_stream.dart:192:44: Error: Type 'DiagnosticableMixin' not found.
abstract class PictureStreamCompleter with DiagnosticableMixin {
^^^^^^^^^^^^^^^^^^^
../../../../../../.pub-cache/hosted/pub.flutter-io.cn/flutter_svg-0.17.2/lib/src/picture_stream.dart:88:7: Error: The type 'DiagnosticableMixin' can't be mixed in.
class PictureStream with DiagnosticableMixin {
^
../../../../../../.pub-cache/hosted/pub.flutter-io.cn/flutter_svg-0.17.2/lib/src/picture_stream.dart:192:16: Error: The type 'DiagnosticableMixin' can't be mixed in.
abstract class PictureStreamCompleter with DiagnosticableMixin {
^
../../../../../../.pub-cache/hosted/pub.flutter-io.cn/flutter_svg-0.17.2/lib/src/picture_stream.dart:167:11: Error: Superclass has no method named 'debugFillProperties'.
super.debugFillProperties(properties);
^^^^^^^^^^^^^^^^^^^
../../../../../../.pub-cache/hosted/pub.flutter-io.cn/flutter_svg-0.17.2/lib/src/picture_stream.dart:171:30: Error: The method 'toStringShort' isn't defined for the class 'PictureStreamCompleter'.

• 'PictureStreamCompleter' is from 'package:flutter_svg/src/picture_stream.dart' ('../../../../../../.pub-cache/hosted/pub.flutter-io.cn/flutter_svg-0.17.2/lib/src/picture_stream.dart').
  Try correcting the name to the name of an existing method, or defining a method named 'toStringShort'.
  ifPresent: _completer?.toStringShort(),
  ^^^^^^^^^^^^^
  ../../../../../../.pub-cache/hosted/pub.flutter-io.cn/flutter_svg-0.17.2/lib/src/picture_stream.dart:266:11: Error: Superclass has no method named 'debugFillProperties'.
  super.debugFillProperties(description);
  ^^^^^^^^^^^^^^^^^^^

Command PhaseScriptExecution failed with a nonzero exit code
`
找到的解决方法为pubspec.yaml文件修改为’ flutter_svg: ^0.18.0‘重新flutter pub get即可
请指正