undefined method `/' for nil:NilClass
C:/Users/hoge/AppData/Local/Temp/ocr73D9.tmp/src/unit.rb:487:in `block in setting_on_battle_map'
C:/Users/hoge/AppData/Local/Temp/ocr73D9.tmp/src/unit.rb:472:in `times'
C:/Users/hoge/AppData/Local/Temp/ocr73D9.tmp/src/unit.rb:472:in `setting_on_battle_map'
C:/Users/hoge/AppData/Local/Temp/ocr73D9.tmp/src/other_class.rb:486:in `block in focus!'
C:/Users/hoge/AppData/Local/Temp/ocr73D9.tmp/src/other_class.rb:480:in `each'
C:/Users/hoge/AppData/Local/Temp/ocr73D9.tmp/src/other_class.rb:480:in `focus!'
C:/Users/hoge/AppData/Local/Temp/ocr73D9.tmp/src/scenes.rb:271:in `main_battle'
C:/Users/hoge/AppData/Local/Temp/ocr73D9.tmp/src/IMPERIALIZER.rb:167:in `block in <main>'
C:/Users/hoge/AppData/Local/Temp/ocr73D9.tmp/src/IMPERIALIZER.rb:41:in `loop'
C:/Users/hoge/AppData/Local/Temp/ocr73D9.tmp/src/IMPERIALIZER.rb:41:in `<main>'