After extending a VMDK file from a Windows file server. The following Event ID entered the Application log:
In the print screen above, you see a VSSVolumeGUID. You can check with the vssadmin command which volumes are active.
Open a command prompt en run the commando: vssadmin list volumes
As you can see in the previous print screen, the volume \\?\Volume{df695619-3a35-11de-a195-806e6f6e6963}\ doesn’t exist anymore.
So how can I remove this error? The solution is simple, open the Scheduled Tasks folder in the Control Panel and remove the ShadowCopyVolume task with the VSSVolumeGUID that doesn’t exist anymore.
Source: KB833779