Collada URDF I/O Error

edit

I'm trying to do the same as here: http://answers.ros.org/question/11238...

That is I try to run:

rosrun collada_urdf urdf_to_collada <path to input.urdf> <path to output.dae>

and it gives this error:

I/O error : No such file or directory
I/O error : No such file or directory
error : xmlNewTextWriterFilename : cannot open uri

Document successfully written to [...]

This is on Ubuntu 14.04.