This error arises when I try to load Alien Biomes (0.7.4) together with Eneas:

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

Mods to be disabled:
- moon-eneas (0.6.4)
- PlanetsLib (1.15.4)

That one is on my radar! Thanks for reporting I will be working on this in the coming days

Sure! Looks like "Muluna, Moon of Nauvis" had a similar issue as seen here:
https://mods.factorio.com/mod/planet-muluna/discussion/676b8c32dcb3bc47add8ca8c

Looks like they added this check:

if mods["alien-biomes"] then
map_gen.autoplace_settings["decorative"] = nil
map_gen.autoplace_settings["entity"].settings["big-sand-rock"] = nil
map_gen.autoplace_settings["entity"].settings["huge-rock"] = nil
map_gen.autoplace_settings["entity"].settings["big-rock"] = nil
end

But I know little of Factorio modding. Maybe this helps.

This does fix the compatability issues technically, what this code does is it just deletes the autoplace for the pieces of decoration that alien biomes takes issue with. Just plopping this into my mod with some minor modifications makes the game playable with both mods enabled.

The downside is that now all these decorative elements are missing, making the planet look much less appealing. This could definitely be worth it to some players who run alien biomes and want to check out eneas. I will think about if I will release this as a bandaid fix for the time being.

Apparently alien biomes does not like it if you use entities and decoration from another surface without properly defining them in my own files. This does not affect all the new assets I have created, but ones that I simply yoinked from nauvis and gleba. Fixing this properly would definitely take some more time and thought.

Since other people are also starting to report this error, this thread will be the main thread for the alien biomes compat.

As a quick workaround, I put this little patch together for myself, and I have uploaded it for other people to find...
https://mods.factorio.com/mod/moon-eneas-alienbiomescompat
It basically sets the "nil" autoplace for each of the decoratives (and the one entity) that AB causes issues with.

I will absolutely replace it with code that does nothing, and set it as depreciated, as soon as this is officially patched.
But this is at least an option for those of us using AB without needing to wait.

Thank you so much for that patch! By no means a perfect solution but it gives me more time to do the full fix and the people that really want to play eneas with alien biomes right now can do so. Its a win win in my book. Hopefully Ill have the proper fix ready within the week, am a little caught up in university at the moment sadly.

As of patch 0.6.10 Eneas now works natively with Alien Biomes! Will mark this as solved, thanks to everyone here for helping.

Thank you very much for your effort. Look forward to landing on the moon now :P

compat mod also now Deprecated and does nothing
(though, its not marked as "Deprecated" in the mod portal, because that actually stops it from downloading the disabling update, so it could continue "working")