# Question about Tween class

**URL:** https://forum.kirupa.com/t/question-about-tween-class/189116
**Category:** flash
**Created:** [May 13, 2006, 10:57pm UTC](https://forum.kirupa.com/t/question-about-tween-class/189116 "2006-05-13T22:57:21Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![huytran88](https://avatars.discourse-cdn.com/v4/letter/h/85e7bf/32.png) [@huytran88](https://forum.kirupa.com/u/huytran88)
#### Post date: [May 13, 2006, 10:57pm UTC](https://forum.kirupa.com/t/question-about-tween-class/189116/1 "2006-05-13T22:57:21Z")

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The source code in the “Using the Tween Class” tutorial doesn’t work in flash MX 2004. In the Test Movie environment, an error was reported. It says “There is no property with the name ‘onMotionFinished’”. Why is that?