Unsure if this is what was already posted in another thread. But if it is, then it hasn't been fixed yet:

Failed to load mods: planetaris-hyarion/compat/arig.lua:125: attempt to index local 'hyper_belt' (a nil value)
stack traceback:
planetaris-hyarion/compat/arig.lua:125: in main chunk
[C]: in function 'require'
planetaris-hyarion/data.lua:41: in main chunk

Hello, idem for me. This error is NOT present with the mod "Mulana, Moon of Nauvis", but without this mod, the error come back.
Have a nice day

+1

I've been looking at the source code to see if I could fix it myself. The error comes from when the Arig mod is loaded, and the Hyarion mod will try to add to or change the information for "hyber_belt".

The actual problem seem to be with defining "hyber_belt" in the Arig mod.

If you remove Arig or add another mod with a difinition for "hyber_belt" (Which I'm pretty sure Mulana has), Hyarion seems to load just fine.

This is just based on a brief lookover, from someone with little experience in Factorio modding code. So take it with a grain of salt.

It seems to be the case I have Advanced Belts mod and the final tier is a Hyper Belt and did get the same error when loading 1.3.7

I have the same error with the current version. But I don't have any of the Advenced Belts mods. If I deactivate Planetaris Unbounded, Planetaris Arig and Atomic Arig Lite that are related, Hyarion runs alone. Mulana is also present, as are almost all the planets on this portal. It must probably be related to Arig.

I have found having both Arig and Visible Planets enabled crashes the game.

Working on it

I couldn't recreate the error but now that Arig is a optional dependency it should always load first, with the changes it wont crash but if the error is still happening the belts would have the arig ingredients and not hyarions, please check :D

Now it works fine, Thank you

With the update I no longer get an error, and the belts have Hyarion ingredients with no alternatives. That's how it's supposed to work right?

Yup, hyarion completely changes the recipe