runtime error: Cannot execute null.is valid for building().
proc name: redraw currently building (/character_class/dm/proc/redraw_currently_building)
  usr: Guest-3473906078 (/player)
  src: Dungeon Master (/character_class/dm)
  call stack:
Dungeon Master (/character_class/dm): redraw currently building(Guest-3473906078 (/player))
Guest-3473906078 (/player): rotate()