Hit test not working

I have four movie clips named bulletL, R, U, and D
On clip events they go in thier directions stated by thier names. When the bullet hitTests the enemy nothing happes. I have no idea what is going on and i was wondering if sombody could help.:pa:

This is the hitTest that I have inside my monster:


if (_root.bulletR.hitTest (this)) { 
_root.points=points++;
_root.Mhp=Mhp--;
this.gotoAndPlay(2);
}