Error: The type 'DiagnosticableMixin' can't be mixed in. class DateTimePickerTheme with DiagnosticableMixin

[MarkBurt]

Flutter 1.22.3 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 8874f21e79 (9 days ago) • 2020-10-29 14:14:35 -0700
Engine • revision a1440ca392
Tools • Dart 2.10.3

The following problems occur after import:
../../../.pub-cache/hosted/pub.flutter-io.cn/flutter_cupertino_date_picker-1.0.26+2/lib/src/date_picker_theme.dart:23:32: Error: Type 'DiagnosticableMixin' not found.
class DateTimePickerTheme with DiagnosticableMixin {
^^^^^^^^^^^^^^^^^^^
../../../.pub-cache/hosted/pub.flutter-io.cn/flutter_cupertino_date_picker-1.0.26+2/lib/src/date_picker_theme.dart:23:7: Error: The type 'DiagnosticableMixin' can't be mixed in.
class DateTimePickerTheme with DiagnosticableMixin {

The solution is:
Removed ‘with DiagnosticableMixin’ or change 'DiagnosticableMixin' to 'Diagnosticable' and it work well for me.

[cxjwin]

same problem

[wisnuwijo]

same problem

[wisnuwijo]

The solution is:
Removed ‘with DiagnosticableMixin’ or change 'DiagnosticableMixin' to 'Diagnosticable' and it work well for me.

The solution is:
Removed ‘with DiagnosticableMixin’ or change 'DiagnosticableMixin' to 'Diagnosticable' and it work well for me.

[BringTheChill]

remove it from where?

[Marcosmaliki]

Why is this closed