Build error Diagnosticable

[mehmet-hakan-yazkan]

Pub/Cache/hosted/pub.dartlang.org/flutter_datetime_picker-1.3.5/lib/src/datetime_picker_theme.dart:4:7: Error: The type 'Diagnosticable' can't be used as supertype.

$ flutter doctor -v
[√] Flutter (Channel master, v1.15.21-pre.2, on Microsoft Windows [Version 10.0.17763.1039], locale de-DE)
• Flutter version 1.15.21-pre.2 at D:\flutter
• Framework revision 210f4d8313 (2 hours ago), 2020-03-11 10:03:05 -0700
• Engine revision 0e2c8feeeb
• Dart version 2.8.0 (build 2.8.0-dev.12.0 9983424a3c)

[√] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
• Android SDK at C:\Users\memoo\AppData\Local\Android\sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-29, build-tools 28.0.3
• Java binary at: D:\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b04)
• All Android licenses accepted.

[√] Chrome - develop for the web
• Chrome at C:\Program Files (x86)\Google\Chrome\Application\chrome.exe

[√] Android Studio (version 3.6)
• Android Studio at D:\Android Studio
• Flutter plugin version 44.0.2
• Dart plugin version 192.7761
• Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b04)

[√] VS Code (version 1.42.1)
• VS Code at C:\Users\memoo\AppData\Local\Programs\Microsoft VS Code
• Flutter extension version 3.8.1

[√] Connected device (3 available)
• SM A505F • RZ8M74QGHPW • android-arm64 • Android 9 (API 28)
• Chrome • chrome • web-javascript • Google Chrome 80.0.3987.132
• Web Server • web-server • web-javascript • Flutter Tools

• No issues found!

[derohimat]

I get this issue like you

[EricPHassey]

Likewise, using the latest Flutter Master build, this is a problem. Didn't have it on the beta build.

[weiyinqing]

我也是这个问题，Flutter Master是同样的版本

[weiyinqing]

I get this issue like you

[vinhcuong]

Aggryyyyy when i update Flutter i get same issue. I wish i don't update Flutter

[xXUlquiScXx]

So? how we can solve this problem? i need to upload an update off my app and i'm stuck with this.

[derohimat]

I fix this issue with this Diagnosticable to DiagnosticableMixin

I fix on local pub.cache

======================================

Or change the

pubspec.yaml

flutter_datetime_picker:
    git:
      url: https://github.com/derohimat/flutter_datetime_picker.git