Backup of an Oracle database fails with an error "Unknown CORBA exception. Unable to contact the media server. Confirm that the Backup Exec Job Engine service is running on the media server"

Hello good day! I have problems when trying to backup a database, you have other copies rare esque database similarly scheduled and done well, but this gives me error. Create a laboratory, reinstall the Symantec Backup and create the job to copy the database and there already does well, but when I return to import my other work returns to give mistake and honestly have no idea what it can be. Would be very grateful if I can help, I attach the error message.
error BD1.png