I tried to log into xWoM today. I was able to open it up and it brought me to the log-in screen. My username and password were arleady there, so I cllicked "Login". After a brief second, an error appeared which stated: 

           "Fatal error:

                Error launching World of Minecraft client:

                java.lange.IllegalArgumentException: Trying to set foreign cookie"

Now, I could probably troubleshoot this myself, but I would very much appreciate some help. I don't wish to uninstall and reinstall World of Minecraft and xWoM again as I have done so in the past to fix the permanent black screen when you try to join a server.

All I request is some assistance in troubleshooting my problem. Thank you. :)

P.S. I have not updated World of Minecraft to its newest version because I'm not sure if there is a new xWoM for the newest version of the World of Minecraft client.