Failed to load mods: Cycle in technology tree detected.

planet-discovery-nauvis
-> automation-science-pack
-> steel-processing
-> advanced-material-processing
-> concrete
-> rocket-silo
-> space-platform
-> space-science-pack
-> space-platform-thruster
-> planet-discovery-nauvis

Edit: Error is related to other planet mods and planetlib. Disabling them fixes this but breaks other planets sadly.

Can you name the problematic panet mods? I'll look at all of them anyway but it would help if you could provide me this information. I think this problem occurs with planets that changes the starting planet as well and that would make them incompatible by design (at least without designing a progression between these two).

Akularis, Froodara, Gerkizia, Mickora, Quadromire. They are all made by the same guy, but they don't seem too interesting at the moment so i don't mind uninstalling them.

Yeah, it currently makes no sense to combine them. As the author states, they are more of a map preset to have more varieties for starting the game. There probably not even gameplay changes.