# Custom Base Classes and Custom Classes

**URL:** https://forum.kirupa.com/t/custom-base-classes-and-custom-classes/291160
**Category:** flash
**Created:** [June 25, 2009, 2:52pm UTC](https://forum.kirupa.com/t/custom-base-classes-and-custom-classes/291160 "2009-06-25T14:52:34Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Foodstuff](https://avatars.discourse-cdn.com/v4/letter/f/90db22/32.png) [@Foodstuff](https://forum.kirupa.com/u/Foodstuff)
#### Post date: [June 25, 2009, 2:52pm UTC](https://forum.kirupa.com/t/custom-base-classes-and-custom-classes/291160/1 "2009-06-25T14:52:34Z")

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I’ve created a base class to house some basic functions I’d like to have across several movie clips in a game I’m making, however, when I link a custom class to the same movie clip I get the message;

“The base class will not be used because the class specified is already defined and extends its own subclass. If you wish to use the base class, please specify a class name in the Class field that will be auto-generated or enter the default base class ‘flash.display.MovieClip’ in the Base Class field.”

I removed the ‘extends MovieClip’ inside the Class but it still shows the message.

Does this mean that I cannot use a custom class _and_ a custom base class on a movie clip?