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Seems to me that you may have not properly set up your ROS network. I wrote an tutorial that might help you

http://www.instructables.com/id/Getting-Started-with-ROS-Robotic-Operating-Syste/?ALLSTEPS

But I would also look more closely at the ROS Wiki and double check your settings. If you check your bashrc with gedit "gedit ~/.bashrc" what do your ROS settings look like?

Seems to me that you may have not properly set up your ROS network. I wrote an a tutorial that might help you

http://www.instructables.com/id/Getting-Started-with-ROS-Robotic-Operating-Syste/?ALLSTEPS

But I would also look more closely at the ROS Wiki and double check your settings. If you check your bashrc with gedit "gedit ~/.bashrc" what do your ROS settings look like?