我在文档里发现了一个错误代码，我游戏玩不了、

#<TypeError: no implicit conversion of nil into String>
E:/Program Files/mycard-1.3.5/lib/ygocore/game.rb:298:in file?' E:/Program Files/mycard-1.3.5/lib/ygocore/game.rb:298:in write_system_conf’
E:/Program Files/mycard-1.3.5/lib/ygocore/game.rb:343:in run_ygocore' E:/Program Files/mycard-1.3.5/lib/quickstart.rb:62:in <top (required)>’
lib/main.rb:41:in require_relative' lib/main.rb:41:in block in ’
lib/main.rb:30:in each' lib/main.rb:30:in ’