rosbag waiting for the map [closed]

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I have a .bag file called kinect.bag and I have downloaded an existing bag from here wget http://pr.willowgarage.com/data/gmapping/basic_localization_stage.bag

I am following this tutorial http://www.ros.org/wiki/slam_gmapping/Tutorials/MappingFromLoggedData but when I use rosrun map_server map_saver is says waiting for the map and it does not save the map.pgm file

I have already use the --clock when I run the .bag file