Roslaunch cannot find launch file after Visp_ros install

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Hi,

So I installed visp_ros package using the instructions here:

http://wiki.ros.org/visp_ros/Tutorial...

After the installation i cannot roslaunch a launch file that is in the catkin workspace and worked perfectly before the visp_ros installation. This is the error:

[launch_file_name.launch] is neither a launch file in package [package_name] nor is [launch_file_name] a launch file name

And when I go directly to the src and type: roslaunch launch_file_name, I get the error:

ERROR: cannot launch node of type package_name/launch_file_name]: can't locate node [node_name] in package [cluster_extraction]

I have source /home/user_name/catkin_ws/devel/setup.sh in .bashrc file.