Error log is here: [17:46:03] [Server thread/INFO] [FML]: [Server thread] Server side modded connec - Pastebin.com
Basically I was building my spawn using FoxGuard, and I had the Wand in my hotbar.
This error seems to be related with this item that plugin uses.
All was working fine, until I disconnected, restarted the server and now I can’t join basically, because this item in my hotbar seems to be creating this error.
I came to ask here because their official discord seems to be dead.