I'm sorry, but an uncaught exception occurred.
While running game code:
  File "game/game_roles/role_head_researcher.rpy", line 840, in <module>
AttributeError: 'NoneType' object has no attribute 'add_unique_on_room_enter_event'
-- Full Traceback ------------------------------------------------------------
Full traceback:
  File "script.rpyc", line 469, in script call
  File "script.rpyc", line 469, in script call
  File "script.rpyc", line 506, in script call
  File "game_roles/role_head_researcher.rpyc", line 840, in script
  File "C:\Users\\Downloads\LabRats2-Reformulate-2024.05-pc\renpy\ast.py", line 1138, in execute
    renpy.python.py_exec_bytecode(self.code.bytecode, self.hide, store=self.store)
  File "C:\Users\\Downloads\LabRats2-Reformulate-2024.05-pc\renpy\python.py", line 1122, in py_exec_bytecode
    exec(bytecode, globals, locals)
  File "game/game_roles/role_head_researcher.rpy", line 840, in <module>
  File "game/people/Ashley/production_assistant_role_definition_ren.py", line 48, in add_mc_serum_intro_action
AttributeError: 'NoneType' object has no attribute 'add_unique_on_room_enter_event'