脚本出错，求助~~~

zhangfuzhou

纯脚本制作的窗口角色状态，已添加窗口的刷新脚本，可是不完善，使用事件角色离队后，窗口不刷新，几秒后显示错误 Window_Base474行发生~~~~
[pre lang="ruby" line="1"]    icons = (actor.state_icons + actor.buff_icons)[0, width / 24][/pre]
全段是
[pre lang="ruby" line="1"]  #--------------------------------------------------------------------------
  # ● 绘制强化／弱化状态的图标
  #--------------------------------------------------------------------------
  def draw_actor_icons(actor, x, y, width = 96)
    icons = (actor.state_icons + actor.buff_icons)[0, width / 24]
    icons.each_with_index {|n, i| draw_icon(n, x + 24 * i, y) }
  end[/pre]
不知道什么地方出错了，下面是窗口刷新脚本

class Game_Actor < Game_Battler
  #----------------------------------------------------------------------------
  # * 重命名方法
  #----------------------------------------------------------------------------
  alias ms_refresh refresh
  alias ms_tp tp=
  alias ms_add_state add_state
  #--------------------------------------------------------------------------
  # * 刷新
  #--------------------------------------------------------------------------
  def refresh
    ms_refresh
    $refresh = true
  end
  #----------------------------------------------------------------------------
  # * 更改 TP
  #----------------------------------------------------------------------------
  def tp=(tp)
    ms_tp(tp)
    $refresh = true
  end
  #----------------------------------------------------------------------------
  # * 附加状态
  #----------------------------------------------------------------------------
  def add_state(state_id)
    ms_add_state(state_id)
    $refresh = true
  end
end

class Game_Party
  #----------------------------------------------------------------------------
  # * 重命名方法
  #----------------------------------------------------------------------------
  alias ms_swap_order swap_order
  #----------------------------------------------------------------------------
  # * 交换顺序
  #----------------------------------------------------------------------------
  def swap_order(index1, index2)
    ms_swap_order(index1, index2)
    $refresh = true
  end
end
求巨巨帮忙~~~

zhangfuzhou

这是出错提示~~~