Error 1137 with Scrolling... Help?

Okay, so the thing tells me that I have Error 1137, that it's expecting no more arguments than 1. I want to get the monster to scroll with the background.

Here's what I've set up for the scrolling under the enter frame handler.

                              var temporaryX:int = background.x;

                              var temporaryY:int = background.y;

                              var scroll_Vx:int = background.x - temporaryX;

                              var scroll_Vy:int = background.y - temporaryY;

Scroll(monster, scroll_Vx, scroll_Vy);

The Green is where the error comes up. I also have a called method for scrolling, which looks like this:

package

{

          import flash.display.Sprite;

          publicclass Scroll

          {

                    publicfunction Scroll(gameObject:Sprite, scroll_Vx:int, scroll_Vy:int):void

                    {

                              gameObject.x += scroll_Vx;

                              gameObject.y += scroll_Vy;

                    }

          }

}

I just really want some assistance. Anything would be appreciated.