Installing Bigbluebutton 2.3 on Ubuntu 18.4

I have installed bigbluebutton video conference on my Ubuntu 18.04 server. I have followed the steps that were described in github https://github.com/bigbluebutton/bbb-install het not really difficult because just running sh script is not that big deal. The server was fresh installed and the script will take care of the rest. After the installing was completed I https://stream.modarsin.com/demo/demo1.jsp this which is started or something wrong. I have this log also

# Potential problems described below
...............
# Warning: The API demos are installed and accessible from:
#
# https://stream.modarsin.com
#
# and
#
# https://stream.modarsin.com/demo/demo1.jsp
#
# These API demos allow anyone to access your server without authentication
# to create/manage meetings and recordings. They are for testing purposes only.
# If you are running a production system, remove them by running:
#
# apt-get purge bbb-demo


#
# Warning: Failed to verify STUN server at stun.l.google.com 19302 with command
#
# stunclient --mode full --localport 30000 stun.l.google.com 19302
#

#
# Warning: Failed to verify STUN server at 172.217.212.127:19302 with command
#
# stunclient --mode full --localport 30000 172.217.212.127 19302


I am looking for someone who can solve this issue.