Unable to load Codex v5 saves

[Moseself]

So, I can't load any Codex modded save files. I made a new game when version 5 came out, got 150ish turns in, and saved for the next day. However, when I attempt to load it or any other new saves made with this version, I get an error and cannot load it. Here's my error message on pastebin: https://pastebin.com/PdTmDb1W

Thanks!