Describe the bug
Disconnects players right away
Log says it couldnt load saved data properly
debug-5.log

At the end of the debug log, you can see the error.

To Reproduce
Steps to reproduce the behavior:

1. Not sure what caused it in the first place to be honest

Mod Version: 1.19.2-3.18.54.881
Forge version: 43.2.14

Not much I can help with here - looks like your server crashed and didn't save backpack data properly because it crashes in vanilla storage code when it just tries to check the format of the data file stored on disc. Only way to fix this is to restore the sophisticatedbackpacks.dat file or simply delete it and lose contents of backpacks but allow the logic to actually work.