VSS_E_OBJECT_NOT_FOUND on Windows 2008 machine

Hi, I’ve a urbackup on a Ubuntu server machine and I’m backupping a Windows 2008 server machine. After last updates all backups fail with this error:

Errori

23/01/18 09:36
backupcom->AddToSnapshotSet(&(Server->ConvertToWchar(selected_vols[i])[0]), GUID_NULL, &additional_refs[i].volid) failed. VSS error code VSS_E_OBJECT_NOT_FOUND

23/01/18 09:36
Indexing Windows components failed
Errori

23/01/18 09:36
Constructing of filelist of “dati_uno” failed: error - index error
Errori

23/01/18 09:36
Backup had an early error. Deleting partial backup.

I tried to remove and reinstall the client on the machine but the problem persists. Some advice to solve it?

Thanks

Any suggestion about this problem? Thanks