upgrade from 1.4 to 1.6 needing help

[gregharkins]

im looking for some help upgrading from 1.4 to 1.6
i have been able to get it on the site and do all the upgrade instrucitons but when i try to access it www.domain.com/(location) i get and error
Opps someting went wrong....

I need help fixing this please

i have went back to 1.4 for now

thanks in advance
if you would rather email me direct thats fine
[email protected]

[JohnDoh]

What is in the Roundcube error log ([rc root]/logs/)?