'am having a problem when using NeumorphicAppBar in flutter
am working with "flutter_neumorphic: ^3.0.3" package and am having a problem when i try to use NeumorphicAppBar 
the Error message: ════════ Exception caught by widgets library ═══════════════════════════════════════════════════════ The following _CastError was thrown building NeumorphicAppBar(dirty, dependencies: [_ModalScopeStatus, _InheritedTheme, _LocalizationsScope-[GlobalKey#61b7d]], state: NeumorphicAppBarState#ad319): Null check operator used on a null value
The relevant error-causing widget was: NeumorphicAppBar file:///D:/most%20important%20stuf/projects/flutter/fixing_todo_app/lib/screens/first_screen.dart:27:21 When the exception was thrown, this was the stack: #0 NeumorphicAppBarState.build (package:flutter_neumorphic/src/widget/app_bar.dart:238:66) #1 StatefulElement.build (package:flutter/src/widgets/framework.dart:4612:27) #2 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4495:15) #3 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4667:11) #4 Element.rebuild (package:flutter/src/widgets/framework.dart:4189:5) ... ════════════════════════════════════════════════════════════════════════════════════════════════════
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