https://pastebin.com/RqQfLxFK

Running on tuinity 1.16.5

No idea how to reproduce the error, I saw it in console so thought i'd post it here.

ItemJoin is out of date, current release version is v5.1.0 but you are running v5.0.6.

However, I would suggest the latest snapshot; https://ci.craftationgaming.com/job/ItemJoin/668/

Tried latest version that doesnt require me to redo configs but got crazy errors
https://pastebin.com/pGz3aKGH

Version I tried: ItemJoin-5.1.1-SNAPSHOT-b660

Great. Because of that ***** players their inventory cleared again lol.

Imma just not use this, no offense.

Edit: Why does it reset configs/ymls? WHY and then by default clear players their inventory, wtf

The config files reset any time there is a major version change such as v5.0.7 to v5.1.1 (the 0 changes to a 1) in this instance. Typically there have only been minor changes to the config files but nobody seems to read the changes and things start to break, hence why most developers implement this type of system of resetting config files when changes like this occur. Do note though your old configs are always backed up prior to this.

The latest snapshot (https://ci.craftationgaming.com/job/ItemJoin/668/) works as intended on Tuinity 1.16.5 but does require redoing configs.

If you are interested in continuing to use this plugin I can always translate your current config files to the latest version for you but you will need to provide them in pastebin.com links.

EDIT:

A lot of issues have been officially fixed in the release of ItemJoin v5.2.0.
You can grab it here; https://www.spigotmc.org/resources/itemjoin.12661/download?version=383801

Please read the changelog as the documentation has not been updated yet;
https://github.com/RockinChaos/ItemJoin/wiki/Recent-Changes