This error usually means that move_base is not running, or that the simple_navigation_goal is not configured with the correct action server name for the move_base node. Do a rostopic list and look for a move_base topic ending in /goal. The entire path preceding the /goal portion is the name of the action server.
Originally posted by Mike Scheutzow with karma: 4903 on 2021-08-21
This answer was ACCEPTED on the original site
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Original comments
Comment by troyelex on 2021-08-23:
Thanks for answering.
after using "jackal/move_base" in client code i am able to send goal to mobe_base server.
Comment by RRK on 2022-02-01:
Hey, mine is /move_base/goal and /move_base_simple/goal, but it is still showing the same error. Can you help?
Comment by Mike Scheutzow on 2022-02-13:
move_base_simple is not an ActionServer, the move_base developers just chose a similar name. An ActionServer will create 3 topics: goal, feedback and result. In your case, the ActionServer name is probably "/move_base" (but look for those other topic names to be sure.)
Comment by distro on 2022-07-23:
@Mike Scheutzow I'm having the same issue where I have the the server name correct(move_base), but nothing happens. I'm trying to use the action client and server move the robot around while it's getting map information from SLAM. Please take a look at my question here