Also, with that change, use
setValue(pacman.score);
cPacman pacman = (cPacman) getObjects(cPacman.class).get(0); setValue(pacman.score);
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo) import java.awt.Color;
cPacman pacman = (cPacman) getWorld().getObjects(cPacman.class).get(0); setValue(pacman.score);