# Application-aware backup for Active Directory fails with error "Mount Volumes failed : [Failed to mount volumes from snap Devices]"

Anapplication-aware backup for Active Directory fails when using a File System Agent that was upgraded from Commvault Version 9.

## Symptom

An application-aware backup for Active Directory using the Virtual Server Agent starts the IntelliSnap backup of a virtual domain controller, but the IntelliSnap backup job fails during the snap catalog phase. The backup job goes Pending and the Job Controller displays the following error message:

    Error Code: [32:392]
    Description: Mount Volumes failed : [Failed to mount volumes from snap Devices]

## Cause

This issue occurs when the virtual domain controller for Active Directory uses a File System Agent that was upgraded from Commvault Version 9.

The upgrade does not enable indexing on the File System Agent, which causes the application-aware backup to fail.

## Resolution

1. Ensure that the File System Agent is using the latest version of indexing.

2. Run the application-aware backup again.

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