# Incompatible override

**URL:** https://forum.kirupa.com/t/incompatible-override/301217
**Category:** Uncategorized
**Created:** [December 5, 2009, 9:11am UTC](https://forum.kirupa.com/t/incompatible-override/301217 "2009-12-05T09:11:29Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![regbolD](https://avatars.discourse-cdn.com/v4/letter/r/ecccb3/32.png) [@regbolD](https://forum.kirupa.com/u/regbolD)
#### Post date: [December 5, 2009, 9:11am UTC](https://forum.kirupa.com/t/incompatible-override/301217/1 "2009-12-05T09:11:29Z")

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if i add **= null** , (even in the class whose method i am overriding) i get that error:

override protected function rollOverHandler(e:MouseEvent\*\* = null\*\*):void {

so this cant be done or what? 😃