Oracle Message ORA-27026 - skgfrls: sbtend returned error

ERRORskgfrls: sbtend returned error
CAUSEsbtend returned an error. This happens during a backup or restore operation.
ACTIONThis error is returned from the media management software which is linked with Oracle. There should be additional messages which explain the cause of the error. This error usually requires contacting the media management vendor.

636847 Composite SAP note ORA-19511