I've got only one error, caused by a missing sound file referenced in my_character.lua, line 241. The file __base__/sound/eat.ogg
has been removed, there are several variations now instead, named 'eat-1.ogg' … 'eat-5.ogg'. Changing the file name in line 241 should fix the crash; optionally, you can add entries for the other variations to the table.
By the way, is there any reason you've added the file lib/character_tool.lua? Just add a dependency on the CharacterModHelper and call its functions – then your mod should work as expected even if I change character handling in the helper mod …