i downloaded a project at "http://wiki.ros.org/multirobot_map_merge" using ROS kinetic but cant execute

edit

I am working on map merging at "http://wiki.ros.org/multirobot_map_merge" I have downloaded and run catkin_make properly. than i type at the command prompt

roslaunch map_merge map_merge.launch

but i receive an error as follow

[map_merge.launch] is neither a launch file in package [map_merge] nor is [map_merge] a launch file name The traceback for the exception was written to the log file

I don't understand what is the problem please guide me