Difficulty passing calls alongto a class object

programming flash
1

Sorry, I wrote about the wrong bug initially. This thread is now titled “can’t remove a movie clip”.

public function set_up_level() {
  trace('control: setting up level');
  unloadMovie(_root['level_failed']);
  unloadMovie(_root['level_passed']);
  unloadMovie(_root['marble2']);
  unloadMovie(_root['current_level']);
  _root.attachMovie('level_' + this.level, 'current_level', 100, {_x: 400, _y: 400});
  this.stop_level();
    }

This function is being triggered, but it’s not unloading the movies above. I also tried removeMovieClip();

I’ve been unable to remove movies period. What am I doing wrong?