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This is a question that has been asked quite often: http://answers.ros.org/questions/scope:all/sort:activity-desc/tags:md5/page:1/

Long story short, either the message/service/action definition on the different PCs (I'm assuming you are running this on different PCs) is different (note that they need to be exactly the same) or you are mixing ROS distributions whicht could lead to md5 differences due to changes to the code generation.

Make sure you are using the same ROS distro, make sure you have the same message/service/action definition and recompile if you change them

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