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Are you launching "sensor.launch", "tracker.launch" and "tracker_viewer-groovy.launch" in three different terminals? You need to run only "tracker_viewer-groovy.launch". By launching all three files, I get the same error which you mentioned. /mapper must subscribes to "/depth_registered/points".

Are you launching "sensor.launch", "tracker.launch" and "tracker_viewer-groovy.launch" in three different terminals? You need to run only "tracker_viewer-groovy.launch". By launching all three files, I get the same error which you mentioned. /mapper must ~~subscribes~~ subscribe to "/depth_registered/points".

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