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rosbag doesn't display map in real-time on rviz

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I am following the gmapping tutorial, and it says: If you don't care to wait until the log playback and mapping process has finished before seeing some results, then you can watch the progress in rviz. rosrun rviz rviz Add a display with a map, set to the topic /map I have rosbag of sample data running in a different terminal. I added a display to rviz with topic /map, but it doesn't seem to show anything. There is an exclamation mark beside "Message". Also, when I type in rqt_graph, no messages are being published to topic /map. How can I resolve this? I appreciate any help as I am new to this. Thanks

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