Cannot run launch file due to many ROS PATH [closed]

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HI there!

When I run hector_elevation_visualization.launch (from hector_navigation package @ https://github.com/tu-darmstadt-ros-p...), i got:

ERROR: cannot launch node of type [hector_elevation_visualization_node/elevation_visualization]: hector_elevation_visualization_node
ROS path [0]=/opt/ros/groovy/share/ros
ROS path [1]=/home/gordon/catkin_ws/src
ROS path [2]=/opt/ros/groovy/share
ROS path [3]=/opt/ros/groovy/stacks

I have set up my environment already, but that is not the problem. Anyway I can correct this error, or set it to run ROS path [1] ?

Thanks for any help!