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im using ros hydro, ubuntu 12.04 .. im working on Make a map and navigate with it using gazebo http://wiki.ros.org/turtlebot_simulator/Tutorials/hydro/Make%20a%20map%20and%20navigate%20with%20it . but i cant navigate the playground, i got this error [ERROR] [1406213257.254638543]: Map_server could not open ~/home/hattan_map5. process[navigation_velocity_smoother-4]: started with pid [9439] [map_server-2] process has died [pid 9329, exit code 255, cmd /opt/ros/hydro/lib/map_server/map_server ~/home/hattan_map5 __name:=map_server __log:=/home/hattan/.ros/log/7297b3bc-1341-11e4-a206-74e5433742d1/map_server-2.log]. log file: /home/hattan/.ros/log/7297b3bc-1341-11e4-a206-74e5433742d1/map_server-2*.log

Originally posted by haider on ROS Answers with karma: 19 on 2014-08-06

Post score: 1

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I believ this error is caused by the pathing described here

~/home/hattan_map5

Try using the absolute path to where this is located (you can find this out by typing pwd in the directory where the map is). Additionally, when you created a map using the map_server, it should have saved to two files: one with the extension .pgm and one with the extension .yaml. Make sure to run roslaunch turtlebot_gazebo amcl_demo.launch map_file:=<full path to your map file>.yaml, and make certain that the image attribute in the.yaml file correctly points to the path of the .pgm.

To clarify, if your files are located at /home/hattan/hattan_map5.yaml and /home/hattan/hattan_map5.pgm, then inside the .yaml file should be the line image: hattan_map5.pgm, and you would run roslaunch turtlebot_gazebo amcl_demo.launch map_file:=/home/hattan/hattan_map5.yaml

Originally posted by ahubers with karma: 301 on 2014-08-06

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Comment by haider on 2014-08-07:
thank you very much . it works very well

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