# Type Error #1123: what and why

**URL:** <https://forum.kirupa.com/t/type-error-1123-what-and-why/323920>\
**Category:** flash\
**Created:** [July 24, 2011, 2:25pm UTC](https://forum.kirupa.com/t/type-error-1123-what-and-why/323920 "2011-07-24T14:25:26Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![TehWut](https://avatars.discourse-cdn.com/v4/letter/t/b38774/32.png) [@TehWut](https://forum.kirupa.com/u/TehWut)\
**Post date:** [July 24, 2011, 2:25pm UTC](https://forum.kirupa.com/t/type-error-1123-what-and-why/323920/1 "2011-07-24T14:25:26Z")

</div>

so, the fighting game class creates an instance of fighter, then adds a child of “dude” to fighter. I want to animate dude, so I tried doing this:

```auto
for (var i:uint = 0; i < fighter.numChildren; i++)
			var mychild = fighter.getChildAt(i);
			fighter.addChild(dude);

```

thats in the constructor.

```auto
fighter.(MyChild as MovieClip.gotoAndPlay("walkingright");

```

that is within the fightinggame.as. Now, the game runs, but when I press right ( the keys that cause that movieclip to animate), it throws a -

TypeError: Error #1123: Filter operator not supported on type Fighter.  
at FightingGame/Update()[C:\Users\Olsen\Documents\FightingGame\FightingGame.as:399]  
at flash.utils::Timer/\_timerDispatch()  
at flash.utils::Timer/tick()

Also the movieclip does not show up, and does not animate. What is this, I can find little information about it, and how do i fix it? the area where it throws the error is the gotoandplay line.