When adding the mod I get the error message: Error while running setup for recipe prototype "stack-inserter" (recipe): Recipe is in 'crafting' category but has a non-item ingredient 'bio-oil' (fluid).

check if the issue persists even with no other mods (official ones are fine). it appears that some other mod is changing the crafting category of stack inserters to "crafting", which is usually fine. however my mod changes its recipe to take a fluid ingredient as well (bio oil) and "crafting" recipes can't have fluid ingredients. try to find the conflicting mod, then I can fix the problem.

Yes, i have only elevated Rails, quality and space age active, nothing else.

I don't have Factorio installed at the moment, so try adding this after line 163 in data.lua in the mod folder. please let me know if it works

data.raw["recipe"]["stack-inserter"].category = "organic"

Yeah, that fixed it. Thanks!

Really like your mod, since I think Gleba recipes are far too simple!