Save a map with Lidar

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I follow this tutorial for save a map : http://wiki.ros.org/slam_gmapping/Tut... I create my own bag, and i see on rviz the Lidar data. But when I launch the command " rosrun gmapping slam_gmapping scan:=base_scan " there are nothing on my terminal. is normal? After that, I wrote "rosbag play --clock nameofmybag.bag" --->>> it's done, and " rosrun map_server map_saver". On my terminal, there are writing "waiting for de map" but nothing after that. What's the problem?

(When i launch the last command, in my another terminal " rosrun gmapping .." they are write : TF_OLD_DATA ignoring data from the past for frame base_footprint at time .... )

Thanks for your Help