Hyper-V backup fails: Cannot start shadow copy - Invalid namespace

Product Version

AhsayOBM: 7.15.0.8 - 7.15.0.20

Operating System

Windows

Symptom

When performing a Hyper-V VM backup, the following error message is displayed on the backup client interface, or in the backup report:

No.	Type	Timestamp	Log
*	...	...	...
*	info	...	Downloading server file list... Completed
*	erro	YYYY/MM/DD hh:mm:ss	Cannot start shadow copy, reason = Failed to get VM State. Error = Invalid namespace
*	...	...	...

Cause

This is a known issue with AhsayOBM version 7.15.0.8 - 7.15.0.20.

Resolution

To resolve the issue, patch the AhsayOBM client application to version 7.15.2.2 or above.

This issue affects a legacy version of our software. We strongly recommend upgrading to the latest AhsayCBS and AhsayOBM release (v9.15.0.0, as of 2025/May/15) for improved performance, compatibility, and security.