you get this message when you use a pose created for another character, but which might work with a little tweaking. Many people create poses for Michael 2 which have more information in them than Michael 1 can handle, so if you use the Mike2 pose on Mike1 it works, but some of the information is discarded. You will also get the same message if you use a Michael pose on Michael-P4 etc. For the most part, you can ignore the message, but use it as a guideline that you might have to adjust the pose a bit to get the desired result.