About "A proxy plugin caused an illegal protocol state." error

This is not a CleanStaffChat issue. This is a limitation of Velocity. Use this plugin to completely solve the problem: https://modrinth.com/plugin/unsignedvelocity2

This plugin gives you the possibility to talk in private chats, for staff and server donors (Donor Chat, can be deactivated). Compatible with BungeeCord, Velocity (also RedisBungee), Folia and Spigot.

FEATURES

> » Obviously, StaffChat;
> » Possibility to deactivate StaffChat globally;
> » Possibility of not seeing StaffChat personally;
> » Possibility to talk in StaffChat without doing commands;
> » RedisBungee support;
> » AFK System;
> » Admin Chat System (Deactivable);
> » Donor Chat System (Deactivable);
> » Discord Integration (Deactivable);
> » StaffList;
> More functions to come...

​

COMMANDS

> » /sc (message) • Send messages in the StaffChat;
> » /sctoggle • Makes StaffChat invisible, just for you;
> » /scmute • Deactivate StaffChat globally;
> » /scafk • Toggle AFK.

> » /ac (message) • Send messages in the AdminChat;
> » /actoggle • Makes AdminChat invisible, just for you;
> » /acmute • Deactivate AdminChat globally;

> » /dc (message) • Send messages in the DonorChat;
> » /dctoggle • Makes DonorChat invisible, just for you;
> » /dcmute • Deactivate DonorChat globally;

> » /stafflist • Shows online staff;

> » /screload • Reloads the plugin.

All commands are configurable in file aliases.yml!

PERMISSIONS

(Configurable from config.yml)