The error snapshot technology (0xE0008526)

Hi all,

I have problem with backup copy .mdb files on the SQL server, when I try doing backup copy always i get some error :

The error snapshot technology (0xE0008526):, Backup Exec could not find for this job software or hardware snapshot technology-based VSS Microsoft (VSS). Select a valid snapshot technology VSS to the target computer.

I don't know, what is it. Please help me with it.