game will not load mods and gives this message without letting me get to the title screen

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 0.1.2
minimalist-rails 2.0.4
quality-asteroids 1.0.1
PlanetsLib 1.8.3
Tiered-Solar-System 3.0.2
PlanetsLib 1.8.3 (not sure why this is repeated on the list)

removing this mod lets my game start so I'll have to play without for now and hope this gets fixed so I can play with this planet enabled later in my game

Well, the error message is not wrong, there is no autoplace for "medium-rock" on Planet OMNI.

I've tried to load the game with the mods on the list, and it just ran fine. I don't know where the problem could be.

Deleting our mod and downloading it again may solve the issue. Because I could not see a problem on our end.

Hope you can solve it to start exploring our planet!

I also got the exact same error while trying to load the mod with a bunch of other mods, so it's not a one off thing
Though the mods it's listing as needing to be turned off aren't the same, and include

omni (0.1.2)
metal-and-stars (0.1.17)
pollution-as-surface-property (1.0.3)
minimalist-rails (2.0.4)
Tiered-Solar-System (3.0.2)
PlanetsLib (1.12.1)

Disabling OMNI then throws the exact same error, except this time for Arboria, and then disabling that enables me to get to the title screen, so I think it's probably some kind of conflict between mods