Error Couldn't resolve publisher host

Hello. I am following the tutorials. However, I am experiencing problems trying to execute the code suggested in Unit 0, point 3: roslaunch sumit_xl_tools start_teleop_with_interactivemarkers.launch
After entering the command the error couldn’t resolve publisher host appears. If I try to open the graphical tools, RVIZ is launched but there is an error in the RobotModel plugging. I am attaching some pictures that show the problems.

Hello Prof, welcome to the Community!

I apologize for this issue. We are looking into it and will get back ASAP.

Hello, the problem is now solved… Thanks

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