When attempting to change a world to a biome bundle generation world I get the attached error. The method I am attempting comes from a reddit post from the mod dev a year ago in which they explain that "Its possible to edit the existing world nbt to be an OTG world and then as long as you rename the biome bundle folder in mods/openterraingenerator/worlds to be the same as your world save name then bb should generate (though with seams between new and old generation)"

I performed this operation as well as others and I get this same error. Other operations include transferring the files from the larger biome bundle folder that is generated automatically into the world folder my friend had made.

crash-2021-02-03_16.21.03-server.txt