Unknown error V-79-57344-65033 – Directory not found

Hi Tech savvy,
I have this problem for quite long time. I have Microsoft Exchange in Windows XP operating system. I do not understand what happened or what went wrong. The error says ‘Directory is invalid. Directory not found. Cannot backup directory’. Really I am in help. Please assist me solve this problem. Thanks in advance.

Errors
Click an error below to locate it in the job log
Backup- \POSTIONMicrosoft Exchange Mailboxes
V-79-5734-65033 – Directory not found. Cannot backup directory Craig Binney
[craigb] and its subdirectories,
V- V-79-5734-65033 – Directory not found. Cannot backup directory Santa claus
[santaclous] and its subdirectories.
