Factorio 2.1 is out there and also a new Krastorio 2 Spaced Out version. Now we have the following error:

Error loading mods
Failed to load mods: planetaris-arig/compat/krastorio2-so.lua:135: module Krastorio2-spaced-out/prototypes/buildings.loader-graphics not found; no such file Krastorio2-spaced-out/prototypes/buildings/loader-graphics.lua
stack traceback:
[C]: in function 'require'
planetaris-arig/compat/krastorio2-so.lua:135: in main chunk
[C]: in function 'require'
planetaris-arig/data.lua:28: in main chunk

Mods to be disabled:

▪ planetaris-arig (1.1.35) ☐ Reset mod settings

In the K2 Discord was the answer: the file required is now in K2, not K2SO. So it's just small fix for Arig.
Would be awesome if this get fixed!

Note this solution was posted on the Github feedback. The file is in Planet Arig/compat/krastorio2-so.lua

Remove line: 135
local graphics = require("Krastorio2-spaced-out.prototypes.buildings.loader-graphics")

replace it with
local graphics = nil
if (mods["Krastorio2"]) then
graphics = require("Krastorio2.prototypes.buildings.loader-graphics")
else
graphics = require("Krastorio2-spaced-out.prototypes.buildings.loader-graphics")
end

Once you fix this error, the next error should be an oil entity error, and I'm currently stuck on that one. I am running Azztweeks pack

Yes, im currently working in the new compat for the k2so changes

"Failed to load mods: Error in assignID: resource-category with name 'oil' does not exist."

I started by disabling mods and finally figured out what the issue was. Inside Prototypes - Pumpjack-updates the last lines of code

" if prototype and prototype.resource_categories then
table.insert(prototype.resource_categories, "oil")
end
"
If you delete those lines of code, it fixes the oil entity problem.

Fox

I cant find in arig:

if prototype and prototype.resource_categories then
table.insert(prototype.resource_categories, "oil")
end

I added the other fix and there is no more errors, its prob another mod

It works, now I have a maraxis compat error but the Arig parts doesn't make problems yet.