Folder redirection failing

I have GPOs with My Docs redirected to \\serverA. I updated the GPO to move the docs to \\serverB and I"m getting this event log error:

Failed to perform redirection of folder My Documents. The files for the redirected folder could not be moved to the new location. The folder is configured to be redirected to <\\serverB\Shares\staffdata\%USERNAME%\My Documents>.  Files were being moved from <\\serverA\staffdata\testgj30> to <\\serverB\Shares\staffdata\testgj30\My Documents>. The following error occurred while copying <\\serverA\staffdata\testgj30\My Music> to <\\serverB\Shares\staffdata\testgj30\My Documents\My Music>:
This security ID may not be assigned as the owner of this object.

I do not have the "give users exclusive control of my documents" selected in the GPO. I also did not pre-create the destination folders on \\serverB.

Thanks!