Backup failure after upgrade to 8.1

[peter hd]

Hi,

We've had a number of backups running, all setup using the plesk backup tool. However, since the upgrade to 8.1, when clicking on the backup icon for in any domain area, all we get is:

-----------------------------------------------------------------------------
ERROR: PleskMainDBException

MySQL query failed: Table 'psa.BackupsRunning' doesn't exist

0: /opt/psa/admin/plib/common_func.php3:213
db_query(string 'select sessionId from BackupsRunning where param = "BackupManagerFactory_domain" and val="5" limit 1')
1: /opt/psa/admin/plib/backup/BackupManagerFactory.php:219
BackupManagerFactoryTable::findByDomain(integer '5')
2: /opt/psa/admin/plib/backup/BackupManagerFactory.php:169
BackupManagerFactory::getDomainSessionId()
3: /opt/psa/admin/plib/backup/BackupManagerFactory.php:83
BackupManagerFactory->fetchByBackupLevel()
4: /opt/psa/admin/htdocs/backup/main_domain.php:21
-----------------------------------------------------------------------------

Is this a problem with 8.1 or the upgrade process. Any help appreciated.