#75 fail2ban-client help ERROR NOK: ('Invalid command',)

[Andrew]

root@yellow:/var/log# fail2ban-client
add get ping set status version
flushlogs help reload start stop
root@yellow:/var/log# fail2ban-client help
ERROR NOK: ('Invalid command',)
Invalid command
root@yellow:/var/log# fail2ban-client version
0.9.3
root@yellow:/var/log#
ubuntu 16.04.3