SAP Message UC0123 - An untreated exception has been triggered

Diagnosis
An untreated exception was triggered when executing the XPRA forSEM-BCS.
The text of the exception is: &V1&&V2&&V3&&V4&.

System Response
The XPRA is not completely executed.

Procedure
End the upgrade.
Manually start the XPRA program UCXPRA400 again.
If the error occurs again, contact the SAP support.