# AS3 debugging

**URL:** <https://forum.kirupa.com/t/as3-debugging/279707>\
**Category:** Uncategorized\
**Created:** [January 18, 2009, 12:48am UTC](https://forum.kirupa.com/t/as3-debugging/279707 "2009-01-18T00:48:57Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Pattt](https://avatars.discourse-cdn.com/v4/letter/p/f1d935/32.png) [@Pattt](https://forum.kirupa.com/u/Pattt)\
**Post date:** [January 18, 2009, 12:48am UTC](https://forum.kirupa.com/t/as3-debugging/279707/1 "2009-01-18T00:48:57Z")

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Hi, I’ve found some bugs in my project, where it says **TypeError: Error #1010** (variable undefined)

But how can I know which one? I’m trying to use the debug tool in CS4 and when the error occurs, I get the position. Then I try to trace the variables in that area, but none are undefined. So how can I know exactly which one it is?