My friend can't join because a bugged Item

[Johnanater]

This is a bug with Unturned and it's hash system for assets.

Tell him to verify his Unturned files, as well as unsubsrcibing from all of his workshop mods, restart the game, then try joining again.

Here's a guide on how to verify your game files:
https://help.steampowered.com/en/faqs/vi...-DA71-93EB