Running lane detection Node

So I am using the turtlebot race 2020 package on github.
But I am facing an error with trying to open the image viewer. I get this error:
Capture

I am using the following turtlebot tutorial:
https://emanual.robotis.com/docs/en/platform/turtlebot3/autonomous_driving/#autonomous-driving

EDIT: Fixed this by going to workstation hosts file in /etc/hosts and then added the IP address of the magni