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learning_joy

I am trying the tutorial with turtlesim and joystick on ROS electric, and Ubuntu 11.4. I keep getting [ERROR] [1324135517.676376697]: Client [/teleop] wants topic /joy to have datatype/md5sum [joy/Joy/e3ef016fcdf22397038b36036c66f7c8], but our version has [sensor_msgs/Joy/5a9ea5f83505693b71e785041e67a8bb]. Dropping connection. I know that the call back has to be changed to sensor_msgs, but I am not sure how to do this.

Thank you, Morpheus