How to enable cubic chunks on server

I transferred a world from single player to an aternos server so I could play with my friends. I know I need to enable cubic chunks in the config file, but the cubicchunks.cfg file isn't present in the server files.

EDIT: here's the log that crashes the server

https://mclo.gs/33vgp5o

Quote from Roman

Does it also crash without the world?

It does. I'm assuming if I could access the cubicchunks.cfg file it would work fine because I would prefer to use this world for my server.

Could be the case. Only the cubicchunks_mixin_config.json file appears in the config.

UPDATE: found out the issue for cubic chunks crashing, after doing some research and troubleshooting, found out that it's not compatible with Magma, which was the software I was using. Probably would've been helpful to add that in the thread. Whoops.