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'...