Removing the object itself by itself

1

i am trying to remove an object itself that is added to a movieclip on the stage.
this is what i have at first:
[AS]
package {
import flash.display.*;

public class DocClass extends MovieClip {
	
	private var _mc:MovieClip;
	private var _otherSprite:MCfromLibrary;
	
	public function DocClass() {
		_mc = new MovieClip();
		_otherMC = new MCfromLibrary();
		_mc.addChild(_otherMC);
		addChild(_mc);
		_otherMC.removeMyself();
	}
}

}

package {
import flash.display.*;

public class MCfromLibrary extends MovieClip {
	
	public function MCfromLibrary() {
		//constructor
	}
	
	public function removeMyself() {
		parent.removeChild(this);
	}
}

}
[/AS]

the MCfromLibrary is a class of a movieclip from the library.
when i try to call the MCfromLibrary::removeMyself(), i got an error of:


ArgumentError: Error #2025: The supplied DisplayObject must be a child of the caller.

how should i remove the object itself through itself?