Game crash on load with this message
"Failed to load mods:
• rubia
• Incompatible with Krastorio2-spaced-out"
please help ASAP, thank you in advanced

Its marked that its no longer usable together.
Read the patch notes too.

(I mean i wish it did not happen but.)
Maybe it will get fixxed in the future.

If you really want to use it you can revert back to a previous version of Rubia

Yeah, the problem we saw on discord is that Krastorio 2 spaced out makes so many edits to crafting chains, it currently leaves you totally trapped on Rubia. Like, you can't craft pumpjacks, which I can fix, but then you run into issues with chemplants, and ammo, etc... As I told someone on discord, I could do a quick fix to make on recipe work, but then he'd immediately run into ANOTHER brick wall. I believe it can be made compatible in the future, but until I have some time to really dig in and look at everything, it would just not actually work.

For now, it is marked as incompatible, to stop people from getting softlocked/trapped on Rubia with a completely impossible recipe chain. Sorry!

If needed and you downgrade, you need to get into editor mode sadly to make it work.

Or download multiple other mods that fix it.(ish)

When I installed K2 Spaced out, any Rubia file I open has the whole base wiped out within 2 minutes.

Here is a current list of issues (that I sent to the K2-SO author, Polka):
1) firearm/piercing magazines => pistol rounds, which don't work with turrets. It is impossible to defend Rubia. It also changes my trigger techs to match in a way where you can have EITHER working turrets OR be allowed to progress.
2) Steel needs coke, which you can't get.
3) Rubia doesn't give copper plates until the very end => you can't make the right pumpjack, long inserters, nor repair packs
4) No stone => again no repair packs
5) Rocket fuel recipe change => You would get stuck halfway through Rubia.

There may be more issues, but this is most certainly NOT what I want anyone to experience when they download Rubia. Sorry.

After quite a bit of work, Polka and I worked out a compatibility patch for K2SO with Rubia. Right now, if you play Rubia in K2SO, it will be substantially more difficult with K2SO's default realistic weaponry physics. I sent her code to conditionally edit everything to be good in difficulty, but it may take her a bit to incorporate.

For now, I am lifting the incompatibility flag because it is now possible to beat Rubia with K2SO. Once the next patch comes out, it should be supported with difficulty that is not substantially harder.

I just saw the update.

I am very grateful!
I am trying to get into the modding scene too ^^
As I want to help as well perhaps in the future.(mods in general for factorio)

This is also good to hear.

Thanks to both you, Loup, and Polka.