Flutter Animate Assertion Error

[opensourcepj]

Steps to reproduce

curve parameter of curve animation set to
Interval((1 / count) * 0, 1.0, curve: Curves.fastOutSlowIn)
where in error count = 0

Expected results

improved error description

Actual results

When the exception was thrown, this was the stack:
#2      Interval.transformInternal
(package:flutter/src/animation/curves.dart:175:12)
#3      ParametricCurve.transform
(package:flutter/src/animation/curves.dart:40:12)
#4      Curve.transform (package:flutter/src/animation/curves.dart:94:18)
#5      CurvedAnimation.value
(package:flutter/src/animation/animations.dart:464:24)
#6      Animatable.evaluate (package:flutter/src/animation/tween.dart:68:66)
#7      _AnimatedEvaluation.value
(package:flutter/src/animation/tween.dart:114:31)
#8      RenderAnimatedOpacityMixin._updateOpacity
(package:flutter/src/rendering/proxy_box.dart:1052:51)
#9      AnimationLocalListenersMixin.notifyListeners
(package:flutter/src/animation/listener_helpers.dart:161:19)
#10     AnimationController._tick
(package:flutter/src/animation/animation_controller.dart:865:5)
#11     Ticker._tick (package:flutter/src/scheduler/ticker.dart:258:12)
#12     SchedulerBinding._invokeFrameCallback
(package:flutter/src/scheduler/binding.dart:1386:15)
#13     SchedulerBinding.handleBeginFrame.<anonymous closure>
(package:flutter/src/scheduler/binding.dart:1233:11)
#14     _LinkedHashMapMixin.forEach
(dart:collection-patch/compact_hash.dart:633:13)
#15     SchedulerBinding.handleBeginFrame
(package:flutter/src/scheduler/binding.dart:1231:17)
#16     SchedulerBinding._handleBeginFrame
(package:flutter/src/scheduler/binding.dart:1148:5)
#17     _invoke1 (dart:ui/hooks.dart:328:13)
#18     PlatformDispatcher._beginFrame (dart:ui/platform_dispatcher.dart:361:5)
#19     _beginFrame (dart:ui/hooks.dart:272:31)

Code sample

Code sample

[Paste your code here]

Screenshots or Video

Screenshots / Video demonstration

[Upload media here]

Logs

Logs

[Paste your logs here]

Flutter Doctor output

Doctor output

[Paste your output here]

[darshankawar]

@opensourcepj
Please provide complete reproducible code sample (ex: main.dart) along with flutter doctor -v so that we can properly address the issue.

[opensourcepj]

Tween(begin: 0.0, end: 1.0).animate(
CurvedAnimation(
parent: animationController!,
curve: Interval((1 / count) * 0, 1.0,
curve: Curves.fastOutSlowIn)))

@darshankawar The error was caused by count being equal to 0 in the above tween.

[darshankawar]

@opensourcepj
I tried to come up with a runnable code sample including your code snippet but not able to replicate the error you reported. Please try to provide us complete code and also provide on which flutter version are you seeing this behavior.

ex: https://github.com/flutter/website/blob/main/examples/animation/animate5/lib/main.dart