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I tested the world on SP and it works on your server. So the problem is related to PaperMC / MineOS.
You might want to contact Paper or MineOS support.
I just tested the world in SP and on a hosting service, the problem must be with MineOS.
Thank you for the help.
👋 Hi there. So basically, I am trying to transfer a world from Aternos to my server on MIneOS, both running PaperMC with the same version. I've read all the threads I can find related to this, I've tried the whole world, just level.dat (didn't change the world), different files but I always get errors when starting the server after uploading the files (screenshot below).
If anyone can help, it would be greatly appreciated 
