Virtual Xen Server backup fails in Symantec Backup Exec 2014

Our Xen Server backup fails within backup exec with primary error: Completed status: Failed
Final error: 0xe00084af - The directory or file was not found, or could not be accessed.
Final error category: Job Errors

Backup- \\XEN\C:V-79-57344-41488 - Due to one or more errors in \\XEN\C:, this backup cannot be used for conversion to virtual machines, Simplified Disaster Recovery (SDR), or a complete online restore.

Directory Windows\Microsoft.NET\assembly\GAC_MSIL\Microsoft.Build.Framework\v4.0_4.0.0.0__b03f5f7f11d50a3a\ was not found, or could not be accessed.

None of the files or subdirectories contained within will be backed up.

I looked in the windows events on the Xen Server:
     Volume Shadow Copy Service error: Unexpected error calling routine IVssBackupComponents::SetContextInternal.  hr =                            0x800706ba,      The RPC server is unavailable.

   Add a Volume to a Shadow Copy Set

   Execution Context: Requestor

I tried reinstalling the client and adding the server back to backup exec to no avail....
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Mark BillExchange, AD, SQL, VMware, HPE, 3PAR, FUD, Anti MS Tekhnet, Pro EE, #1Commented:

Has this backup ever worked before or is this a new backup?

JRome225Author Commented:
new backup
JRome225Author Commented:
Turned out to be due to a mapped drive/share on the Xen.

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JRome225Author Commented:
Self solved
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