Upgrading vCenter Server Appliance 5.0 to 5.1 error

Hello,

I am trying to upgrade our vCenter appliance from 5.0 to 5.1 and keep running into the following error:

Error exporting DB

Thu, 06 Dec 2012 08:47:33 +0000 *** ERROR: Failed to execute command '/etc/va/upgrade/pre-scripts/02_embedded_db.sh' 8 ***

This error is found within upgrade.log.

I'm following the upgrade steps as outline here:

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2033990

Has anyone else come across this problem?

Cheers.