Error on velocity

[01:13:15 FATAL]: A plugin tried to deny a command with signable component(s). This is not supported. Disconnecting player mani1232 [01:13:15 INFO]: [connected player] mani1232 (/78.234.118.71:60037) has disconnected: A proxy plugin caused an illegal protocol state. Contact your network administrator.

if enter command not in whitelist