every time I load into an existing world, I get a crash with the error "UUID string too large"
here is my crash log
crash-2025-01-01_14.18.40-server.txt

Do you have any files in the player config folder that weren't created by the mod? Did you rename any files there?

not that I am aware of, I haven't changed any files or done anything like that manually

Can you check if there are any unusual files there that aren't just <user UUID>.toml?

no <user UUID>.toml but there is <user UUID>.dat and <user UUID>.dat_old

I mean the data\openpartiesandclaims\player-configs folder with OPAC player configs.

comparing my UUID against the name of the file, they're identical

oh in there, yeah there's nothing apart from <user UUID>.toml and a folder called sub-configs

The error is claiming that there's a file there with a name that is too long to be a UUID.

I have minecraft on an exFAT partition, would that play into anything?

That is very strange. Can you send me the file?

7bc13e85-ec51-4ece-b19d-71998a26e8bd.toml.zip

Ok, so there is something going on there with AppleDouble files. I think it's related to where the "too long" file name comes from.
Can you test the following jar file and send me the new crash report? download link

crash-2025-01-07_21.00.07-server.txt

Thanks! It all makes sense now. Now I'm wondering what else these AppleDouble files can break.

not sure but they have caused me significant grief in the past with other minecraft related things