1454 - VSS error in the Windows event log: Unexpected error on routine call

Modified on Mon, 21 Jul at 12:57 PM

Symptom

When a backup completes, you may encounter a Windows event log similar to the following:

Volume shadow copy service error: Unexpected error on routine call
IVssAsrWriterBackup::GetAsrMetadata. hr = 0x80070001, Incorrect function.
Operation:Event PrepareForBackup

Cause

The issue (event ID 8193) may be caused by an invalid entry inside the following registry subtree:

Hkey_Local_Machine\Software\Microsoft\Windows NT\CurrentVersion\ProfileList

Solution

Open the Registry Editor (regedit).
Expand into the abovementioned subtree and check within it if there is an entry that has a .bak value appended. If so, this may be causing the failure when trying to resolve the SID of the writer.
Backup the registry key first, then delete the entry with the extra .bak value.
Reboot the machine to check if the issue has been fixed.