how do i resolve this error?

[Dilshan97]

This error comes when we use the animations we created. but these animations work fine in the timeline. how to fix this issue?

Performing hot restart... Syncing files to device AOSP on IA Emulator... Restarted application in 3,121ms. E/flutter (18251): [ERROR:flutter/shell/common/shell.cc(199)] Dart Error: Unhandled exception: E/flutter (18251): Looking up a deactivated widget's ancestor is unsafe. E/flutter (18251): At this point the state of the widget's element tree is no longer stable. E/flutter (18251): To safely refer to a widget's ancestor in its dispose() method, save a reference to the ancestor by calling dependOnInheritedWidgetOfExactType() in the widget's didChangeDependencies() method. E/flutter (18251): #0 Element._debugCheckStateIsActiveForAncestorLookup. (package:flutter/src/widgets/framework.dart:3508:9) E/flutter (18251): #1 Element._debugCheckStateIsActiveForAncestorLookup (package:flutter/src/widgets/framework.dart:3522:6) E/flutter (18251): #2 Element.findAncestorStateOfType (package:flutter/src/widgets/framework.dart:3641:12) E/flutter (18251): #3 Navigator.of (package:flutter/src/widgets/navigator.dart:1492:19) E/flutter (18251): #4 _CustomSplashState.build. (package:custom_splash/custom_splash.dart:122:23) E/flutter (18251): #5 _RootZone.runUnary (dart:async/zone.dart:1381:54) E/flutter (18251): #6 _FutureListener.handleValue (dart:async/future_impl.dart:139:18) E/flutter (18251): #7 Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:680:45) E/flutter (18251): #8 Future._propagateToListeners (dart:async/future_impl.dart:709:32) E/flutter (18251): #9 Future._complete (dart:async/future_impl.dart:514:7) E/flutter (18251): #10 new Future.delayed. (dart:async/future.dart:313:16) E/flutter (18251): #11 Timer._createTimer. (dart:async-patch/timer_patch.dart:23:15) E/flutter (18251): #12 _Timer._runTimers (dart:isolate-patch/timer_impl.dart:384:19) E/flutter (18251): #13 _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:418:5) E/flutter (18251): #14 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:174:12)