Failed to load mods: Error while running setup for space-location prototype "OMNI" (planet): medium-rock (decorative) does not have an autoplace specification.

Mods to be disabled:

Omni, minimalist-rails, diurnal-dynamics, planetslib, cupric-asteroid

Some people have already pointed that out. Apparently, there's some compatibility issue with the mod "alien biomes" and some others. I looked into it, and it didn't seem like something I could solve on my own end. Sorry.

I also ran into this issue. Very frustrating. The loading only fails with Alien Biomes present, although the error message mentions a lot of other mods.

You shouldn't worry about the Alien Biomes incompatibility; many other planet/space age mods are incompatible with Alien Biomes at this point, I think it's better for players to just avoid using it (at least for Space Age)

You shouldn't worry about the Alien Biomes incompatibility; many other planet/space age mods are incompatible with Alien Biomes at this point, I think it's better for players to just avoid using it (at least for Space Age)

proceeding to ignore even more reports

You shouldn't worry about the Alien Biomes incompatibility; many other planet/space age mods are incompatible with Alien Biomes at this point, I think it's better for players to just avoid using it (at least for Space Age)

What do you mean Kryzeth, I've not yet met a mod that wasn't compatible with alien biomes

I've not yet met a mod that wasn't compatible with alien biomes

Planet mods specifically?

The problem is that Alien Biomes removes things from the base game (for some reason), mainly decoratives, that other planets depend on.

I can't remember which specific planets have/had issues with Alien Biomes, or whether they've been fixed, but it's been a longstanding issue, ever since I first released Enable All Planets, and I just didn't care enough to track down the problematic planets (when Alien Biomes is the one causing the problem)

It's probably the biggest reason Alien Biomes is one of the only "anti-recommendations" listed on the Foundry discord, because it breaks planets:

The only reason to get Alien Biomes anyways was to make Nauvis more interesting by adding more biomes; it's pointless for planet mods, because they can just depend on the graphics mod instead, and then apply the alien biomes to their planets, without breaking the rest of the game.