It keeps saying at the start of getWorld().addObject '(' or'public class test_tower_icon extends Actor { /** * Act - do whatever the test_tower_icon wants to do. This method is called whenever * the 'Act' or 'Run' button gets pressed in the environment. */ public void act() { if(!Greenfoot.mousePressed(null)) { test_tower_state_placement test_tower_state_placement = new test_tower_state_placement getWorld().addObject(new test_tower_state_placement(), getX(), getY()); } } }