[nag] Troube upgrading Nag 2.0.4 to 2.1

[Nick Maynard]

Hello all,

I'm attempting to upgrade a working installation of Nag 2.0.4 to 2.1.
Sadly, when I attempt to use the Nag 2.1 installation, I receive the 
following error on the webpage:

Fatal error: Call to a member function on a non-object in 
/home/hosting/web/tastycake/www.tastycake.net/horde-3.1/nag-h3-2.1/lib/Driver/sql.php 
on line 428

I checked the nag_tasks table in MySQL, and it has the same structure as 
defined in nag.sql.

This is mostly a standard (stable) install of Horde 3.1.1.  In addition, 
we also have an old CVS installation of whups.

I'm a little confused - usually Horde upgrades go very smoothly!

Please could anyone suggest a resolution for the problem?

Thank you,
Nick