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2017-11-27 07:33:36 -0500 asked a question REQUIRED process [hector_mapping-2]

REQUIRED process [hector_mapping-2] Hello everyone new in ROS and in programming in general, I take again a robotic inst

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2016-12-05 07:03:51 -0500 asked a question I take over an artistic installation

Hello everybody, I take over an artistic installation consisting of a server and several robots that form a pack carrying out various actions. The robots are equipped with "Rplidar", an MD25 motor controller, and have an Odroide XU4 I have two problems of which I do not understand the origin. Here is the first as described by RViz.

If anyone can help me with this, I would be very grateful

Transform [sender=/rplidarNode]
For frame [base_laser_link]: No transform to fixed frame [map]. TF error: [Lookup would require extrapolation into the past. Requested time 1356998640.019958958 but the earliest data is at time 1480940455.240634146, when looking up transform from frame [base_laser_link] to frame [map]]