Code Error dont know why

programming flash
1

hey guys, i got this code from a Newgrounds tut,



onClipEvent(enterFrame) {

    if(!touchingGround) {
        grav++;
        this._y+=grav;
    }else{
        grav=0;
    }
    if(_root.ground.hitTest(_x,_y,true)) {
        touchingGround=true;
    } else {
        touchingGround=false;
    }

it says there is a problem with the first line and the closing bracket.

also i got a problem with the x and y coordinates, i have a frame that does not match the other ones even though the xy numbers are the same.