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I came here via google for a different problem that produced the same error message, what I did was rename an rqt plugin but then kept getting failures trying to rosrun it because I didn't clean up the old rqt config file. I think rqt --force-discover also does it, but I ended up first deleting .config/ros.org/rqt_gui.ini and then my newly named plugin started working. (I also deleted old files in devel and build and install that were pointing to the old named plugin, but this probably wasn't necessary)

I came here via google for a different problem that produced the same error message, what I did was rename an rqt plugin but then kept getting failures trying to rosrun it because I didn't clean up the old rqt config file. I think rqt --force-discover --force-discover also does it, but I ended up first deleting .config/ros.org/rqt_gui.ini .config/ros.org/rqt_gui.ini and then my newly named plugin started working. (I also deleted old files in devel and build and install that were pointing to the old named plugin, but this probably wasn't necessary)