It appears that your old normalizations prevent vitality based effects from working (and also starting the game if said effects exist).
While running game code:
File "game/script.rpy", line 110, in script
python:
File "game/script.rpy", line 116, in <module>
chars = load_characters("chars", Char)
File "game/library/functions - loading_data.rpy", line 227, in load_characters
char.init() # Normalize!
File "game/library/characters/classes - characters.rpy", line 3244, in init
setattr(self, stat, self.get_max(stat))
File "game/library/characters/classes - characters.rpy", line 3317, in __setattr__
if key == 'vitality' and effects['Drowsy']['active']:
KeyError: 'Drowsy'