Exception when sliding panel

[hoiihop]

The following assertion was thrown while dispatching notifications for SlidingUpPanelController:
AnimationController.animateTo() called after AnimationController.dispose()
AnimationController methods should not be used after calling dispose.
'package:flutter/src/animation/animation_controller.dart':
Failed assertion: line 533 pos 7: '_ticker != null'

When the exception was thrown, this was the stack: 
#2      AnimationController.animateTo (package:flutter/src/animation/animation_controller.dart:533:7)
#3      _SlidingUpPanelWidgetState.expand (package:flutter_sliding_up_panel/sliding_up_panel_widget.dart:332:26)
#4      _SlidingUpPanelWidgetState.handlePanelStatusChanged (package:flutter_sliding_up_panel/sliding_up_panel_widget.dart:365:9)
#5      ChangeNotifier.notifyListeners (package:flutter/src/foundation/change_notifier.dart:351:24)
#6      ValueNotifier.value= (package:flutter/src/foundation/change_notifier.dart:456:5)
#7      _SlidingUpPanelWidgetState.expand (package:flutter_sliding_up_panel/sliding_up_panel_widget.dart:334:28)
#8      _SlidingUpPanelWidgetState._handleDragEnd (package:flutter_sliding_up_panel/sliding_up_panel_widget.dart:297:9)
#9      DragGestureRecognizer._checkEnd.<anonymous closure> (package:flutter/src/gestures/monodrag.dart:521:47)
#10     GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:253:24)
#11     DragGestureRecognizer._checkEnd (package:flutter/src/gestures/monodrag.dart:521:5)
#12     DragGestureRecognizer.didStopTrackingLastPointer (package:flutter/src/gestures/monodrag.dart:426:9)
#13     OneSequenceGestureRecognizer.stopTrackingPointer (package:flutter/src/gestures/recognizer.dart:446:9)
#14     DragGestureRecognizer._giveUpPointer (package:flutter/src/gestures/monodrag.dart:435:5)
#15     DragGestureRecognizer.handleEvent (package:flutter/src/gestures/monodrag.dart:354:7)
#16     PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:98:12)
#17     PointerRouter._dispatchEventToRoutes.<anonymous closure> (package:flutter/src/gestures/pointer_router.dart:143:9)
#18     _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:617:13)
#19     PointerRouter._dispatchEventToRoutes (package:flutter/src/gestures/pointer_router.dart:141:18)
#20     PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:127:7)
#21     GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:460:19)
#22     GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:440:22)
#23     RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:337:11)
#24     GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:395:7)
#25     GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:357:5)
#26     GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:314:7)
#27     GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:295:7)
#28     _invoke1 (dart:ui/hooks.dart:167:13)
#29     PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:341:7)
#30     _dispatchPointerDataPacket (dart:ui/hooks.dart:94:31)
(elided 2 frames from class _AssertionError)
The SlidingUpPanelController sending notification was: SlidingUpPanelController#6b6cf(SlidingUpPanelStatus.expanded)

[brasizza]

Same here

[PashaArkus]

I had the same situation and the problem was that the SlidingUpPanelController was in a separate file and was not recreated when the state of the widget where it was called changed. This is how the animation controller tried to trigger an animation on a legacy widget.

[MirzaAhmedBaig]

call dispose on SlidingUpPanelController inside dispose() of statefull widget.