I keep getting 'Invalid arguments in set_current_car'

Code:
PANEL* car_pan =
{
	pos_x = 30;
	pos_y = 120;
	bmap = "car1.bmp";
	layer = 100;
	flags = SHOW;
}

function set_current_car()
{
       ent_morph(car_pan, "car2.bmp");
}