ActionScript3 Error 5007

Question

I have this very simple program to do for a school project. I'm making a set of games based on the revolutionary war (irrelevant in this matter). This game involves an instance called player pushing a barrel off of a boat. Using my textbook, I have come up with code for a keyboard event that should move the player. The problem I get is that when I try to view my SWF, I get this 5007 error code and the player does not move. I'll post the code below. And I apologize in advance, my professor really just taught us basics and asked us to work with what we have. I think I can figure out the rest of my project if I can get this player to move.

package  
{

import flash.display.MovieClip;
import flash.events.KeyboardEvent;
import flash.ui.Keyboard;


public class Main_Character extends MovieClip {


    public function Main_Character() {

        init();
    }
    function init():void
    {
        stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyDown);
        }
        public function onKeyDown(event:KeyboardEvent):void
        {
            if (event.keyCode == Keyboard.LEFT)
            {
                player.x -= 10;
                }
            else if (event.keyCode == Keyboard.RIGHT)
            {
                player.x += 10;
                }
            else if (event.keyCode == Keyboard.DOWN)
            {
                player.y += 10;
                }
                else if (event.keyCode == Keyboard.UP)
            {
                player.y -= 10;
        }
    }
}

}

Answer 1

Check your document class name , and check if all .as files are saved.