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First, you need to make sure that you have /map published.

To check it, run:

rostopic list

see that you have /map in the list.

To check /map message published, run:

rostopic echo /map

Next, if you have the /map published but you don't see it in Rviz, then you should have a problem in Rviz setup. If you found that /map is not published, check your gmapping, it might be that you don't have proper /tf or other reasons.