I'm sorry, but an uncaught exception occurred.
While running game code:
File "game/ascript/mlf_house.rpy", line 75, in script
call screen but_nav('mlf_house.hall')
File "renpy/common/000statements.rpy", line 531, in execute_call_screen
store._return = renpy.call_screen(name, *args, **kwargs)
File "game/ascript/inventory.rpy", line 133, in execute
screen inventory_useitem(item) tag inv:
File "game/ascript/inventory.rpy", line 133, in execute
screen inventory_useitem(item) tag inv:
File "game/ascript/inventory.rpy", line 137, in execute
if item == i_laptop and not laptop_lock:
NameError: name 'laptop_lock' is not defined