can not find urdf.why?how to solve it?

edit

Ha! I just came across this a few minutes ago and see that it has already been answered in this forum elsewhere. The short answer is that there was a ROS package change that now requires a different command line than what is shown in the tutorials. Try the following and it should work:

check_urdf my_robot.urdf

"rosrun" and the package name are not required.