# Class can't extend Document Class, or can it?

**URL:** <https://forum.kirupa.com/t/class-cant-extend-document-class-or-can-it/308610>\
**Category:** flash\
**Created:** [April 27, 2010, 12:56am UTC](https://forum.kirupa.com/t/class-cant-extend-document-class-or-can-it/308610 "2010-04-27T00:56:15Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![jany](https://avatars.discourse-cdn.com/v4/letter/j/ce7236/32.png) [@jany](https://forum.kirupa.com/u/jany)\
**Post date:** [April 27, 2010, 12:56am UTC](https://forum.kirupa.com/t/class-cant-extend-document-class-or-can-it/308610/1 "2010-04-27T00:56:15Z")

</div>

I have two classes. One is my Document Class, and another extends my Document Class.

It doesn’t work, and gives me this error

“Error #2136: The SWF file MyGame.swf contains invalid data.” :gas:

Any ideas? ty ty