Unknown Error (-23) prevents Sync from happening - what is the solution?

When I plug the iPad into the Mac and iTunes opens. The iTunes software "verifies" my iPad then the error message appears:
Attempting to copy to the disk myiPad failed. An unknown error occurred (-23).
Anyone else had this problem and have a fix?

Joe ~
"It turns out I was working with a corrupt ePub file. I was able to install a different German edition on my iPad with no problem. I'm not sure if the "-23" refers to a bad ePub file but if you see this during a synchronization you should also see another message referring to the file that caused the error. Check the source of that file to make sure it's legit. If possible, download a new version and see if the problem goes away. That's what worked for me."
...Found by doing THIS.

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    ...Found by doing THIS.

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