widget dispose error

[hjc22]

[ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: This ticker was canceled: _WidgetTicker(created by _TimerBarState#c5d53(lifecycle state: created, tickers: tracking 1 ticker))
E/flutter (18394): #0 SimpleAnimatable.play (package:money_topic/components/anim/animatable.dart:94:5)
E/flutter (18394):
E/flutter (18394): #1 ChainAnimatable.play (package:money_topic/components/anim/animatable.dart:169:24)
E/flutter (18394):
E/flutter (18394): #2 TogetherAnimatable.play (package:money_topic/components/anim/animatable.dart:124:40)
E/flutter (18394):
E/flutter (18394): #3 Anim._start (package:money_topic/components/anim/anim.dart:173:25)

[hjc22]

my code:

dispose(){
anim.dispose();
super.dispose();
}