[jitsi-users] Problem adding Gtalk account

I can't seem to add my Gtalk account to Jitsi. I suspect the problem is
caused by having the same username in Facebook Chat.

When I try to add my user, whether I type the correct password or not, I
instantly get the following error message: "This user already exists on the
selected network. Please choose another user or network."

However when I add another Gtalk user with a different email address, it