Error in Running a real time controller tutorial [closed]

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hi everyone!! I'm doing the tutorial in pr2_mechanism section (http://www.ros.org/wiki/pr2_mechanism/Tutorials/Running%20a%20realtime%20joint%20controller): Running a real time controller, i followed every single step but i get the following problems when i try to load the controller.. any suggestions?

luigi@luigi-pc:~$ rosrun pr2_controller_manager pr2_controller_manager list-types ethercat_trigger_controllers/MultiTriggerController ethercat_trigger_controllers/ProjectorController ethercat_trigger_controllers/TriggerController my_controller_pkg/MyControllerPlugin pr2_calibration_controllers/CasterCalibrationController pr2_calibration_controllers/FakeCalibrationController pr2_calibration_controllers/GripperCalibrationController pr2_calibration_controllers/JointCalibrationController pr2_calibration_controllers/WristCalibrationController pr2_controller_manager/TestController pr2_mechanism_controllers/CasterController pr2_mechanism_controllers/CasterControllerNode pr2_mechanism_controllers/LaserScannerTrajController pr2_mechanism_controllers/Pr2BaseController pr2_mechanism_controllers/Pr2BaseController2 pr2_mechanism_controllers/Pr2GripperController pr2_mechanism_controllers/Pr2Odometry robot_mechanism_controllers/CartesianPoseController robot_mechanism_controllers/CartesianTwistController robot_mechanism_controllers/CartesianWrenchController robot_mechanism_controllers/JTCartesianController robot_mechanism_controllers/JointEffortController robot_mechanism_controllers/JointPositionController robot_mechanism_controllers/JointSplineTrajectoryController robot_mechanism_controllers/JointTrajectoryActionController robot_mechanism_controllers/JointVelocityController youbot_description/CartesianComplianceController youbot_description/JointPositionController youbot_description/JointVelocityController youbot_description/YouBotUniversalController luigi@luigi-pc:~$ rosrun pr2_controller_manager pr2_controller_manager load my_controller_pkg Error when loading my_controller_name

Thank you in advance

Luigi