This error may occur when creating a image or clone. 

This is because the SID for the server_audit user from the source SQL Server will be different to the SID for the server_audit login on the destination SQL Server (that creates image or hosts clone).

This can be fixed by creating server_audit user in destination SQL Server (that creates image or hosts clone) with same SID as in source SQL Server.

To get server_audit user  SID of source SQL Server

SELECT sid

FROM master.sys.sysusers
WHERE name = 'server_audit';

To create server_audit user in destination SQL Server (that creates image or hosts clone) with same SID

CREATE LOGIN server_audit
WITH PASSWORD = '*******',
SID = {sid copied from source server}