Error during self.channel_layer.group_add

One more thing to try:

In the shell, run the following commands and report back what the results are:

(No output is expected from this first command)
import socket

socket.gethostname()

socket.getfqdn()

socket.getfqdn('127.0.0.1')

(Side note: I cribbed this from Encoding with 'idna' codec failed (UnicodeError: label empty or too long) - #12 by KenWhitesell)