When trying to load, I get the following error:

Failed to load mods: __core__/lualib/dataloader.lua:18: Invalid prototype array {}
stack traceback:
    [C]: in function 'error'
    __core__/lualib/dataloader.lua:18: in function 'extend'
    __interstellar-travel__/compat/twelpa/janus.lua:127: in main chunk
    [C]: in function 'require'
    __interstellar-travel__/data-updates.lua:280: in main chunk

Mods to be disabled:
• interstellar-travel (1.0.1)

I have all of the planets from "Enable Planet Mods Lite" (https://mods.factorio.com/mod/kry-planet-mods-lite), which includes Janus, Tiber, Tenebris, and Cubium in that system, so I don't think that the /compat/twelpa/janus.lua:127 should be returning an empty array, but I might be misunderstanding the error message.

I am able to replicate the error with only Interstellar Travel, Enable Planet Mods Lite, and their respective dependencies.

Ah, it looks like I fixed this for Tenebris + Janus, but I missed Janus + Tiber combination.

And it is happening because the Tiber route takes priority over the Cubium route. The Tiber route has to be added from the Tiber compat file because it needs access to the specific asteroid spawn defs that mod uses. Should be fixed in 1.0.2.