Create launcher for save_map

I wonder how is possible to create a launcher for saving a map after gmapping using a launcher. In my case I create two simultaneous maps. I created a launcher but it is giving the following error: [map_server-1] process has died [pid 21969, exit code 255, cmd /opt/ros/kinetic/lib/map_server/map_server /home/christen/catkin_ws/src/map_filtering __name:=map_server __log:=/home/christen/.ros/log/058df484-23a4-11e9-b2e5-08002707828c/map_server-1.log]. log file: /home/christen/.ros/log/058df484-23a4-11e9-b2e5-08002707828c/map_server-1*.log [map_server_2-2] process has died [pid 21970, exit code 255, cmd /opt/ros/kinetic/lib/map_server/map_server /home/christen/catkin_ws/src/map_filtering __name:=map_server_2 __log:=/home/christen/.ros/log/058df484-23a4-11e9-b2e5-08002707828c/map_server_2-2.log]. log file: /home/christen/.ros/log/058df484-23a4-11e9-b2e5-08002707828c/map_server_2-2*.log The launcher I created is the following: with args I understand the directory where the maps are going to be saved, maybe I am wrong. Do you spot the error? How do I add an argument to save the map with a customized name? Thanks for your time :)