MaterialBasedCupertinoThemeData isn't defined for the class PlatformApp

[samanzamani]

Hi
I try use PlatformApp but i got this error message.

Error: The method 'MaterialBasedCupertinoThemeData' isn't defined for the class '#lib1::PlatformApp'.
Try correcting the name to the name of an existing method, or defining a method named 'MaterialBasedCupertinoThemeData'.
MaterialBasedCupertinoThemeData(materialTheme: unifiedTheme),

Same error for me, even when building the example:

flutter: ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
flutter: The following _CompileTimeError was thrown building MyApp(dirty):
flutter: 'package:platty/src/platform_app.dart': error: line 65 pos 13:
flutter: file:///Users/tom/Code/platty/lib/src/platform_app.dart:65:13: Error: The method
flutter: 'MaterialBasedCupertinoThemeData' isn't defined for the class '#lib1::PlatformApp'.
flutter: Try correcting the name to the name of an existing method, or defining a method named
flutter: 'MaterialBasedCupertinoThemeData'.
flutter: MaterialBasedCupertinoThemeData(materialTheme: unifiedTheme),
flutter: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
flutter: MaterialBasedCupertinoThemeData(materialTheme: unifiedTheme),
flutter: ^
flutter:
flutter: When the exception was thrown, this was the stack:
flutter: #0 MyApp.build
package:example/main.dart:12
flutter: #1 StatelessElement.build
package:flutter/…/widgets/framework.dart:3774
flutter: #2 ComponentElement.performRebuild
package:flutter/…/widgets/framework.dart:3721
flutter: #3 Element.rebuild
package:flutter/…/widgets/framework.dart:3547
flutter: #4 ComponentElement._firstBuild
package:flutter/…/widgets/framework.dart:3701
flutter: #5 ComponentElement.mount
package:flutter/…/widgets/framework.dart:3696
flutter: #6 Element.inflateWidget
package:flutter/…/widgets/framework.dart:2950
flutter: #7 Element.updateChild
package:flutter/…/widgets/framework.dart:2753
flutter: #8 RenderObjectToWidgetElement._rebuild
package:flutter/…/widgets/binding.dart:909
flutter: #9 RenderObjectToWidgetElement.mount
package:flutter/…/widgets/binding.dart:880
flutter: #10 RenderObjectToWidgetAdapter.attachToRenderTree.
package:flutter/…/widgets/binding.dart:826
flutter: #11 BuildOwner.buildScope
package:flutter/…/widgets/framework.dart:2266
flutter: #12 RenderObjectToWidgetAdapter.attachToRenderTree
package:flutter/…/widgets/binding.dart:825
flutter: #13 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.attachRootWidget
package:flutter/…/widgets/binding.dart:712
flutter: #14 runApp
package:flutter/…/widgets/binding.dart:756
flutter: #15 main
package:example/main.dart:6
flutter: #16 _startIsolate. (dart:isolate/runtime/libisolate_patch.dart:289:19)
flutter: #17 _RawReceivePortImpl._handleMessage (dart:isolate/runtime/libisolate_patch.dart:171:12)
flutter: ════════════════════════════════════════════════════════════════════════════════════════════════════