# You know the answer to this

**URL:** <https://forum.kirupa.com/t/you-know-the-answer-to-this/314159>\
**Category:** Uncategorized\
**Created:** [September 20, 2010, 4:05pm UTC](https://forum.kirupa.com/t/you-know-the-answer-to-this/314159 "2010-09-20T16:05:15Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![aeson](https://avatars.discourse-cdn.com/v4/letter/a/db5fbb/32.png) [@aeson](https://forum.kirupa.com/u/aeson)\
**Post date:** [September 20, 2010, 4:05pm UTC](https://forum.kirupa.com/t/you-know-the-answer-to-this/314159/1 "2010-09-20T16:05:15Z")

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Please bare with me, I just started doing AS about a month ago.  
I have a small graphical player and I want to load an external mp3 file into it. Now once the mp3 file is playing, I want the Play button to not play the same file again. Maybe these pictures will explain better what I mean…

the code is working in this pic:  
 ![](http://forum.kirupa.com/uploads/kirupa/6344/50ec94ec7c77da92.png)

the code is not working in this pic:  
 ![](http://forum.kirupa.com/uploads/kirupa/6346/7e66394b36cc101c.jpg)

I know, I can use “removeEventListener” instead and it will work the way I want it to, but I wanted to know if some expert here could explain to me why this is giving me this error.

thank you all in advance :),

Aeson