I'm having these errors on login.
https://hastebin.com/oxugohinej.bash

Also items become invisible when taken to the inventory on 1.12.2 with ProtocolSupport (idk if this issue is about protocollib or protocolsupport but it only occurs when i load Protocollib)

Versions: http://prntscr.com/norac2
Plugins: http://prntscr.com/norahs

No one knows the solve i guess :c

Update to one of the dev builds