Unable to Copy or Backup. WD My Book Premium ES, Windows XP, Retrospect 2.0 Error message

When attempting to do a Backup or Copy using the supplied software (Retrospect Express HD 2.0) I receive the following error message: Retrospect has encountered a serious error: Assertion Failure at “Elem.cpp-933”  Is this a hardware or software problem? Tried reinstalling the software but same results.

If you install the software in  a different computer, do you find the same issue?