CMX Proxy proxyctl members add is not a valid command

[XEDLINUX]

Hi, 

I am setting up a cmxproxy in order for my WLC to work with CMX cloud but then I tried to follow the document provided by cisco on how to add member by using the command: 

[cmxadmin@CMX ~]$
[cmxadmin@CMX ~]$ proxyctl members add
Usage: proxyctl [OPTIONS] COMMAND [ARGS]...

Error: No such command "members".
[cmxadmin@CMX ~]$
[cmxadmin@CMX ~]$

Please help if you have experience this issue. Thank you.