AnimationController.dispose() called more than once · Issue #58 · aagarwal1012/Animated-Text-Kit · GitHub
package:flutter/src/animation/animation_controller.dart': Failed assertion: line 822 pos 12: 'elapsedInSeconds >= 0.0': is not true · Issue #101203 · flutter/flutter · GitHub
Value of type 'dart.core::int' can't be assigned to a variable of type 'dart.core::double' · Issue #6 · mcrovero/rubber · GitHub
![package:flutter/src/animation/animation_controller.dart': Failed assertion: line 246 pos 15: 'vsync != null': is not true - Stack Overflow package:flutter/src/animation/animation_controller.dart': Failed assertion: line 246 pos 15: 'vsync != null': is not true - Stack Overflow](https://i.stack.imgur.com/GGvX7.jpg?s=64&g=1)