Hi,
Please refer to the above technote
Snapshot provider error (0xE000851C): Cache files required for the Volume Snapshot Provider (VSP) snapshot could not be created. Check that there is at least 50 MB of free disk space, and review the settings for the snapshot that are reported in the job log. Check the Windows Event Viewer for details.
http://support.veritas.com/docs/274096
Hope this helps
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