代码出错...求解！

负零

1. class Game_Battler < Game_BattlerBase
   
2.   alias get_actor_id_item_apply item_apply     
   
3.   #--------------------------------------------------------------------------
   
4.   # ● 应用技能／物品的效果
   
5.   #--------------------------------------------------------------------------
   
6.   def item_apply(user, item)
   
7.     if actor?
   
8.     get_actor_id_item_apply(user,item)
   
9.     $game_variables[6] = @actor_id
   
10.   else
    
11.     $game_variables[6] = @index
    
12.   end
    
13. end
    
14. end

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1. class Scene_MagicAffect
   
2.   #--------------------------------------------------------------------------
   
3.   # ● 常量
   
4.   #--------------------------------------------------------------------------
   
5.    
   
6.   #--------------------------------------------------------------------------
   
7.   # ● 全局变量
   
8.   #--------------------------------------------------------------------------
   
9.   
   
10.   #--------------------------------------------------------------------------
    
11.   # ● 类变量
    
12.   #--------------------------------------------------------------------------
    
13.   def initialize
    
14.   @target_id=$game_variables[6]
    
15.   end
    
16. def magic_mvsl
    
17.     initialize
    
18.     p @target_id
    
19.     p  $game_troop[@target_id].state?(503)
    
20.     if $game_troop[@target_id].state?(503)
    
21.        $game_troop[@target_id].hp=100
    
22.       $game_message.add("YES")
    
23.     else
    
24.       $game_message.add("10")
    
25.    end
    
26. end

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这代码的想法是获取敌人群组内的ID，如果该ID敌人包含设定的状态，则HP=100.
实在百思不得其解...请高手指点。

沙漠点灰

$game_troop有属性members(和Game_Party差不多)
$game_troop.members[@target_id]

还有....代码缩进...强迫症伤不起= =
把硬编码换成常量 = =