# TypeError: Error #1010: ..WHY?

**URL:** <https://forum.kirupa.com/t/typeerror-error-1010-why/270489>\
**Category:** flash\
**Created:** [September 10, 2008, 2:20pm UTC](https://forum.kirupa.com/t/typeerror-error-1010-why/270489 "2008-09-10T14:20:34Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![dragonfly](https://avatars.discourse-cdn.com/v4/letter/d/8e8cbc/32.png) [@dragonfly](https://forum.kirupa.com/u/dragonfly)\
**Post date:** [September 10, 2008, 2:20pm UTC](https://forum.kirupa.com/t/typeerror-error-1010-why/270489/1 "2008-09-10T14:20:34Z")

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Hello, I’m just starting with AS3 and am confused by this error:

TypeError: Error #1010: A term is undefined and has no properties.  
at com.

It occurs when I don’t remove an event listener that is called for Event.COMPLETE. I am building an app that loads external (local) swf files. When they complete loading, unless i remove the event listener for Event.COMPLETE within the handler function, it calls that error.

Thats fine with me, but I just want to understand what’s going on.

Thanks.