Action client error [closed]

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Hello all,

I am trying to write an action client to follow my joint trajectories, when I run my program I get this error:

[ERROR] [1360022717.274015327, 1360022717.267940998]: Client [/H20_player] wants topic /left_joint_trajectory_action/feedback to have datatype/md5sum [drrobot_jaguar4x4_player/JointTrajectoryActionFeedback/aae20e09065c3809e8a8e87c4c8953fd], but our version has [control_msgs/FollowJointTrajectoryActionFeedback/868e86353778bcb1c5689adaa01a40d7]. Dropping connection.
[ERROR] [1360022717.274118903, 1360022717.267940998]: Client [/H20_player] wants topic /left_joint_trajectory_action/result to have datatype/md5sum [drrobot_jaguar4x4_player/JointTrajectoryActionResult/1eb06eeff08fa7ea874431638cb52332], but our version has [control_msgs/FollowJointTrajectoryActionResult/bce83d50f7bb28226801436caf0e2043]. Dropping connection.
[ERROR] [1360022717.374791247, 1360022717.370970964]: Client [/left_joint_trajectory_action] wants topic /left_joint_trajectory_action/goal to have datatype/md5sum [control_msgs/FollowJointTrajectoryActionGoal/8f3e00277a7b5b7c60e1ac5be35ddfa2], but our version has [drrobot_jaguar4x4_player/JointTrajectoryActionGoal/aee77e81e3afb8d91af4939d603609d8]. Dropping connection.

Does anyone know where I can fix my error? Thanks in advance!

Kind Regards, Martin