The first error message in your screenshot mentions "puppet" in the file variables.gd, but AricsExpansion only uses that word once and never in that file. The rest of those errors appear to be derived from that error. So the question to you is "where did that come from"? Did you try to use this mod with another mod or did you edit the scripts? This mod states in the first post that there is very limited compatibility with other mods, due to the extensive scope of this mod.
Since your mod menu appears to work, you should be able to reset your mods to recover. If you run into future issues, then you may want to extract a brand new Strive folder, because sometimes things get left behind by mods after significant early errors.