Error message:

Failed to load mods: Error while running setup for recipe prototype "uncompress-check-valve" (recipe): Subgroup must be defined when there is no common main product.

This was with version:
omnimatter_compression (4.1.10) and flow-control-expanded-bob (1.1.50)

try updating omnilibrary, i'm on 4.1.15 and this doesn't happen, let me know

Hrm, I have that ominlibrary version, still crashes on startup for me.

Hmmm this is weird, i'll look into it, could you please get me a savefile with all your modlist?

Sure, do you have a discord handle?

Not on this pc, upload it somewhere i'll download it

Here is the file with save, mod-list.json, mod-settings.dat
https://www.mediafire.com/file/mcyvryz1fv1vkou/FactorioBug.zip/file

let me know if you need anything else. I may be a bit slow to update during work hours (gmt-4) as I'll be behind VPN.

alright, i fixed it, was enough to lower the duplicate remove function to data-updates stage as i just realised a lot of mods to copy-paste stuff in final fixes stage.
BTW use "PUMPS" not "higher tier offshore pumps" i deprecated that in favor of PUMPS, which is basically the same with more options, better graphics, and better everything else it also features ground water pumpjacks

sounds good, will switch the mod over

yep, it also has migration files, completely lossless

Still had to run around and add power poles to a bunch of pumps though

you can also disable power requirements for a more vanilla like (they won't require power poles)

power requirements are fine, they make sense