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As I assumed, it's a namespace problem. Your observation_sources parameter is defined outside of the corresponding namespace of the layer plugin.

Change this...

observation_sources: laser

to this:

  observation_sources: laser

... assuming that your launch file sets the correct namespace for the load parameter of the move_base node (like in the move_base tutorial).

Generally speaking, imho this should be explicitly mentioned somewhere in the Groovy->Hydro migration tutorial for move_base and costmap_2d since I ran into the very same problem and I guess @CarolineQ and me are not the only ROS noobs who make this experience.