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Just to be clear: you either use gmapping or amcl. Both do particle-filtering based localization. While gmapping also builds a map, amcl requires an already built map on the map server. You cannot use amcl and gmapping at the same time.

After you built a map using gmapping and saved it to a file, you need to stop gmapping, start the map server to provide your map and run amcl.

Just to be clear: you You either use gmapping or amcl. Both do particle-filtering based localization. While gmapping also builds a map, amcl requires an already built map on the map server. You cannot use amcl and gmapping at the same time.

After you built a map using gmapping and saved it to a file, you need to stop gmapping, start the map server to provide your map and run amcl.