出现TypeError 错误求解决 - Project1

#==============================================================================
# ■ Scene_Read
#==============================================================================
class Scene_Read_NM
#--------------------------------------------------------------------------
# ● 主处理
#--------------------------------------------------------------------------
def main
sp = Spriteset_Map.new
@read_window = Window_Reader.new([""], 0)
@read_window.opacity = 230
@read_window.z = 900
text = Dir["txt/*"]
@text = []
for tx in text
@text.push (tx.split(/\//)[1].split(/.txt/)[0])
end
@command_window = Window_Command.new(180, @text)
@command_window.y = (480 - @command_window.height)/2
@command_window.opacity = 230
@command_window.z = 999
@doing = 1
Graphics.transition
# 主循环
loop do
# 刷新游戏画面
Graphics.update
# 刷新输入信息
Input.update
# 刷新画面
update
# 如果画面切换的话就中断循环
if $scene != self
break
end
end
# 准备过渡
Graphics.freeze
@command_window.dispose if !@command_window.disposed?
@read_window.dispose
sp.dispose
end
def update
case @doing
when 1 #选书
update_1
when 2 #读书
update_2
end
end
def update_1
@command_window.update
if Input.trigger?(Input::B)
$game_system.se_play($data_system.cancel_se)
$scene = Scene_Map.new
end
if Input.trigger?(Input::C)
$game_system.se_play($data_system.decision_se)
filename = "txt/" + @command_window.commands[@command_window.index] + ".txt"
file = File.open(filename, "r")
r = file.readlines
@real_text = []
for i in 0...r.size
temp_story = r[i].split(/\n/)[0]
temp_story.gsub!(/,/) {"，"} if temp_story != nil
temp_story.gsub!(/\./) {"。"} if temp_story != nil
temp_story.gsub!(/ /) {"　"} if temp_story != nil
while(temp_story != nil)
text = ""
if temp_story.length > 75
text = temp_story.slice!(0,75)
else
text = temp_story
temp_story = nil
end
@real_text.push(text)
end
end
file.close
@read_window.renew(@real_text, 0)
@command_window.visible = false
@command_window.active = false
@doing = 2
end
end
def update_2
@read_window.update
if Input.trigger?(Input::B)
$game_system.se_play($data_system.cancel_se)
@command_window.visible = true
@command_window.active = true
@doing = 1
end
if Input.trigger?(Input::UP)
$game_system.se_play($data_system.cursor_se)
@read_window.minus_1
end
if Input.trigger?(Input::DOWN)
$game_system.se_play($data_system.cursor_se)
@read_window.add_1
end
if Input.trigger?(Input::L) or Input.trigger?(Input::LEFT)
$game_system.se_play($data_system.cursor_se)
@read_window.page_back
end
if Input.trigger?(Input::R) or Input.trigger?(Input::RIGHT)
$game_system.se_play($data_system.cursor_se)
@read_window.page_add
end
end
end

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