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I am able to display the model and move the joints correctly with the same command as given above.
$ roslaunch rrbot_description rrbot_rviz.launch
So, I thought the problem is resolved. But Today, in the morning, I was again facing same problem. I tried to diagnose what is the problem that has again occurred.
The only thing that I found was a "roscore" running from last 1-2 days. I mean, it was running already and I did my roslaunch in another terminal. I am not sure if this is the problem.
I tried to duplicate the problem, by running roscore in one terminal and launching above launch file in another terminal. But I could not duplicate my problem. Probably roscore was too fresh and had not malfunctioned as yet.
Anyway, I am not sure what was the reason why, sometimes I can not display it properly. However, at least one thing I am sure now, that whatever it was, it was with my computer and the above launch file correctly displays the model. Thanks for all the help.
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