Invalid command. please use a valid server command

when attempting to travel i get the following:

"Invalid command. please use a valid server command"
Permissions to use and to admin is granted

I am running command   /PorkysC
config shows as:

{
  "Servers": {
    "PorkysC": {
      "IP": "82.7.234.6",
      "Port": 26015
    }
  }
}


Am i missing something?  do i need to install Nexus? or it automatically installed?
Thanks

try only lowercase for commands

Fantastic,  that sorted it.
Many thanks
brilliant plugin and i will be leaving a positive review

Changed Status from Pending to Closed