Using DPM 2019, I get the error, "An unexpected error occurred while the job was running. (ID 104 Details: Unspecified error (0x80004005))" This error only occurs on one VM that we're trying to backup to tape, all the other VMs succeed. I have
tried the following Answer down below of removing "NullProviderInstalled"=dword:00000001 in regedit, but this fails to work for us.
https://social.technet.microsoft.com/Forums/lync/en-US/91f3e4aa-0e0f-4f43-b4ad-80b8ea324dc7/an-unexpected-error-occurred-while-the-job-was-running-id-104-details-unknown-error-0x80110802?forum=dpmfilebackup