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Create Map from Rosbag

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Hi I am having problem with creating map(.pgm and .yaml) files. First i tried to create a map using the existing bag file following [this](http://wiki.ros.org/slam_gmapping/Tutorials/MappingFromLoggedData#download) tutorial. I was successful to create map. Now I created a bag file following [this](http://wiki.ros.org/rosbag/Tutorials/Recording%20and%20playing%20back%20data) tutorial. I created a bag file. But when I try to create a map using this newly created bag file I am getting the message ras@ubuntu:~/bagfiles$ rosrun map_server map_saver -f ~/testmap [ INFO] [1470969136.155361289]: Waiting for the map I am confused what is wrong with creating the bag file. This is to mention, when i created bag file I made rosparam set use_sim_time false and when I create map using bag file I made rosparam set use_sim_time true Can anyone please help me regarding this. Thanks.

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