For the first one, try game.surfaces['nauvis']
For the second one, try defines.events.on_entity_died

Thanks a ton! I think I found a fix for the first one but using what you've shown me for the second one I was able to fix quite a few error related to missing underscores and I've learned what ...

I'm brand new to this game but not lua, what steps do I need to take to update broken mods? I've already checked out the game.on_ now = script.on_ thing but I'm still getting some erros

https://gyazo.com/2955bdfd6992b32f89fdf8a2f5ff3a81.png
https://gyazo.com/014c7e961c8f67537267cf7cda7518ef.png ...