# Error

**URL:** <https://forum.kirupa.com/t/error/332029>\
**Category:** Uncategorized\
**Created:** [January 4, 2014, 5:05pm UTC](https://forum.kirupa.com/t/error/332029 "2014-01-04T17:05:34Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![rozwaz](https://avatars.discourse-cdn.com/v4/letter/r/dec6dc/32.png) [@rozwaz](https://forum.kirupa.com/u/rozwaz)\
**Post date:** [January 4, 2014, 5:05pm UTC](https://forum.kirupa.com/t/error/332029/1 "2014-01-04T17:05:34Z")

</div>

Receiving the error:  
Incompatible Override,  
Overriding a function that is not marked for override

why is this? I want the button to play sound when it is clicked.  
Error is referring to the line with the function on.

[SIZE=6][FONT=arial black]Code:[/FONT][/SIZE]

[FONT=book antiqua]playbutton1.addEventListener (MouseEvent.MOUSE\_DOWN,isPlaying);  
function isPlaying( evt:MouseEvent )  
{  
soundchannel = mysound.play(0,2);  
}  
[/FONT]