dmitrykurakin

Same problem ``` Try calling using ?. instead. SchedulerBinding.instance.addPostFrameCallback((_) { ^^^^^^^^^^^^^^^^^^^^ /...AppData/Local/Pub/Cache/hosted/pub.dartlang.org/syncfusion_flutter_datepicker-20.1.59/lib/src/date_picker/date_picker.dart:9826:31: Error: Method 'addPostFrameCallback' cannot be called on 'SchedulerBinding?' because it is potentially null. - 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart'...

same problem ``` Launching lib\main.dart on Chrome in debug mode... /C:/Users/dmitr/AppData/Local/Pub/Cache/hosted/pub.dev/getwidget-5.0.0/lib/components/card/gf_card.dart:118:11: Error: 'CardThemeData' isn't a type. final CardThemeData cardTheme = CardTheme.of(context); ^^^^^^^^^^^^^ Failed to compile application. Exited (1). ```