EDIT: Seems to have been caused by a modpack updating Shattered Planet, but not Shattered Planet Assets, causing a mismatch. Solved by manually updating the assets mod. Leaving the issue here in case someone else runs into the same problem.

Mod won't load, with the following message:
Failed to load mods: File _ skewer_shattered_planet_assets _/graphics/technology/promethium_plate.png not found

Added a re-colored version if the standard iron plate png from factorio just to see if that was enough, but then there's the sprite out of bounds error which I can't remember how to fix (did it manually once before for another mod), so I'm leaving it for now. Thought I'd report this anyway so it can be looked at and potentially fixed with the intended graphics.

Maybe this should've been reported on the assets mod but I figured this would be the better place to post.