Unable to register controller to pr2_control_manager

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Hi all,

I have followed the tutorial here successfully: http://wiki.ros.org/pr2_mechanism/Tut...

As at the end I see:

my_controller_pkg /home/sam/catkin_ws/src/my_controller_pkg/controller_plugins.xml

after running

 rospack plugins --attrib=plugin pr2_controller_interface

in the terminal.

However when I attempt the next tutorial: http://wiki.ros.org/pr2_mechanism/Tut...

I get an error in step 4.3. As instructed I enter:

rosrun pr2_controller_manager pr2_controller_manager list-types

However MyControllerPlugin doesn't appear in the list.

Any help would be greatly appreciated thanks, Sam