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I think you forgot to paste in the actual error. But anyway, the md5sum is a hash of the message and an md5sum mismatch means that the different machines are using different definitions for the same message type. Very likely this is because the message was modified but not compiled on one of the machines.

Note that this is a pretty common error and is mentioned on the Troubleshooting page; please have a good look there next time you run into trouble.

I think you forgot to paste in the actual error. But anyway, the md5sum is a hash of the message and an md5sum mismatch means that the different machines are using different definitions for the same message type. Very likely this is because the message was modified but not compiled on one of the machines.

EDIT: What dornhege said, while I was typing mine. :) But still:

Note that this is a pretty common error and is mentioned on the Troubleshooting page; please have a good look there next time you run into trouble.