Help with error

import greenfoot.*;  // (World, Actor, GreenfootImage, and Greenfoot)

public class Key extends Actor
{
private int wait = 0;  
private final int waitTime = 35;  
private boolean touchingPlayer = false;

   /**
     * Create a new key.
     */
public void act()
{
    movementAi();
    die();
    hitPlayer();
    checkTouchingStatus();
   }
  private void checkTouchingStatus()  
     {  
    if (wait > 0) wait--;  
    if (wait == 0) touchingPlayer = false;
}
    //movement  
  
  public void movementAi() 
  {
      
    move(2);
    if(Greenfoot.getRandomNumber(100) < 10)
    {
        turn(Greenfoot.getRandomNumber(90));   
    
    }
    if (getX() <= 5 || getX() >= getWorld().getWidth() - 5)
    {
        turn(180);
    
    }
    if (getY() <= 5 || getY() >= getWorld().getHeight() - 5)
    {
       turn(180);
    
    }
}
//If health is 0
    public void die()
    {
    if (getHealth() == 0)
    {
        
        menu menuWorld = (menu) getWorld();
        Bar scoreBar = menuWorld.getScoreBarValue();
        scoreBar.add(50);
        getWorld().removeObject(this);
        
    }
    }

//Enemy health
    private int health = 3;//or any other starting value;  
      
    public void setHealth(int points) {  
        health += points;  
    }  
    public int getHealth() {  
        return health;  
    }  
    
         public void hitPlayer() {  
    key2 key2 = (key2) getOneObjectAtOffset(0, 0, key2.class);  
    if (key2 != null && !touchingPlayer) {  
          menu menuWorld = (menu) getWorld(); //Do this every time to call method!!!
          Bar healthBar = menuWorld.getHealthBarValue();
          healthBar.subtract(1);//decrements the health of your player
          touchingPlayer = true;  
            wait += waitTime;
        
        
      
    

}
   
          
        
          
}
}