Pending (Destination not available)

This issue is killing me but I am a total hack who is lucky to know how to turn on a computer.

I am using a My Passport Elite 250 meg on a computer with Windows XP SP3.  The drive solely serves as place to backup files  but I only back connect for backup in frequently given the PC is not used extensively.  I recovered some pictures several months ago when the main drive crashed but have not been able to recover my music.  The Backup Plans all show on the computer and there are files that has been saved but I keep getting the Pending (Destination not avalilable) message.  

I have seen prior posts that have said to use notepad to modify the xml file but the changes did not work but given I am low tech, I could be the problem and did not understand exactly what to change.  I am thinking the Elite drive must work since I recovered material previously and the Restore feature does show files backed up.  Any ideas?  Thank you in advance for any help you can offer. 

What program did you used to backup your files?

Thank you for the help.  WD Anywhere Backup I believe is the backup software.