setState() or markNeedsBuild() called during build

[asghar mahmoodi]

Hi guys,
On the real device the appbar not appear and it cause below exception:

`══╡ EXCEPTION CAUGHT BY FOUNDATION LIBRARY ╞════════════════════════════════════════════════════════
The following assertion was thrown while dispatching notifications for FeedProvider:
setState() or markNeedsBuild() called during build.
This _DefaultInheritedProviderScope widget cannot be marked as needing to build
because the framework is already in the process of building widgets. A widget can be marked as
needing to be built during the build phase only if one of its ancestors is currently building. This
exception is allowed because the framework builds parent widgets before children, which means a
dirty descendant will always be built. Otherwise, the framework might not visit this widget during
this build phase.
The widget on which setState() or markNeedsBuild() was called was:
_DefaultInheritedProviderScope
The widget which was currently being built when the offending call was made was:
Builder

When the exception was thrown, this was the stack:
#0 Element.markNeedsBuild. (package:flutter/src/widgets/framework.dart:4210:11)
#1 Element.markNeedsBuild (package:flutter/src/widgets/framework.dart:4225:6)
#2 _InheritedProviderScopeMixin.markNeedsNotifyDependents (package:provider/src/inherited_provider.dart:269:5)
#3 ChangeNotifier.notifyListeners (package:flutter/src/foundation/change_notifier.dart:243:25)
#4 FeedProvider.setScreenController (package:seventy_mm/controller/provider.dart:117:5)
#5 _AppBaseState.initState (package:seventy_mm/view/app_base/app_base.dart:46:14)
#6 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4704:57)
#7 ComponentElement.mount (package:flutter/src/widgets/framework.dart:4541:5)
... Normal element mounting (166 frames)
#173 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3603:14)
#174 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:6170:32)
... Normal element mounting (143 frames)
#317 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3603:14)
#318 Element.updateChild (package:flutter/src/widgets/framework.dart:3355:20)
#319 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4592:16)
#320 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4739:11)
#321 Element.rebuild (package:flutter/src/widgets/framework.dart:4261:5)
#322 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2578:33)
#323 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:875:21)
#324 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:329:5)
#325 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1144:15)
#326 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1082:9)
#327 SchedulerBinding.scheduleWarmUpFrame. (package:flutter/src/scheduler/binding.dart:865:7)
(elided 11 frames from class _RawReceivePortImpl, class _Timer, dart:async, and dart:async-patch)`