Shooting Game Missile Flaw

I'm making a Space Invaders-type game. Y'know? Arrow keys to fly Space to shoot? Well, shooting isn't working so well. I have two .as files: Ship.as which controls the ship's ActionScript, and Missile.as which is supposed to control the missile. When I hit load it up I get the error: The class or interface 'Missile' could not be loaded.

I'm making a Space Invaders-type game. Y'know? Arrow keys to fly Space to shoot? Well, shooting isn't working so well. I have two .as files: Ship.as which controls the ship's ActionScript, and Missile.as which is supposed to control the missile. When I hit load it up I get the error: The class or interface 'Missile' could not be loaded. When I press spacebar, the missile appears and just sits there on the stage doing nothing.

Here's the missile ActionScript:

Actionscript Code:

class Missile extends MovieClip
{
    var speed;
    
    function onLoad()
    {
        speed = 20;
    }
    
    function.onEnterFrame()
    {
        _x += speed;
        if(_x > 600)
        {
            this.removeMovieClip();
        }
    }
}

...and here's the ship ActionScript:

Actionscript Code:

class Ship extends MovieClip
{
    var velocity;
    var shootLimiter;
    
    function onLoad()
    {
        velocity = 10;
        shootLimiter = 0;
    }
    
    function onEnterFrame()
    {
        shootLimiter += 1;
        
        if( Key.isDown(Key.LEFT) ){ _x -= velocity; }
        
        if( Key.isDown(Key.RIGHT) ){ _x += velocity; }
        
        if(Key.isDown(Key.UP) ){ _y -= velocity; }
        
        if( Key.isDown(Key.DOWN) ){ _y += velocity; }
        
        if( Key.isDown(Key.SPACE) && shootLimiter > 8)
        {
            shootLimiter = 0;
            var missile = _root.attachMovie("Missile","Missile" + _root.getNextHighestDepth(), _root.getNextHighestDepth());
            missile._x = _x + 50;
            missile._y = _y + 2;
        }
    }
}

Please help, I've been trying to figure this out for days. >_<;

PROBLEM SOLVED! I had to put all of the files in the same folder in order for them to be located. And here I thought it was an ActionScript issue.