ROs Gazebo error on open URDF (roslaunch error)

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Hi guys, I'm working with an hexapod in a project, so i need to import it from solid works to gazebo. I tried to use an URDF exporter, and it generated an folder with 2 launchs (gazebo.launch & display.launch). I tried to execute the gazebo.launch with roslaunch. It bring me an error https://gist.github.com/anonymous/5e56cbfb2f6b3f24de0d

So I openned my .launch file: https://gist.github.com/anonymous/244301079d768c7aaf75

And change some lines, getting this: https://gist.github.com/anonymous/57f95f42fb4b5cfc4ebc

And now it is returning the following error: https://gist.github.com/anonymous/6f603553edcc25128ae5

Someone know waht should i do?