[horde] Upgrading from Groupware 1.0.8 to 1.2.3

[Chris Funk]

I am trying to upgrade from Horde Groupware Webmail 1.0.8 to 1.2.3.
The setup script copies the old files fine, then moves on to the  
database.  The first script executed  
(2008-08-29_fix_mdb2_sequences.php) produces the  following error:

Call to a member function listTables() on a non-object in
/data/web/web3/web/w1/scripts/upgrades/2008-08-29_fix_mdb2_sequences.

In an attempt to move past this issue, I commented out that script in  
the setup script.

After doing that the script seems to start processing ok, but then  
errors out when trying to update the database with:

Writing main configuration file
Loading database module...
Updating database...
[ ERROR! ] Reading the existing table structure failed. Error messages:
MDB2 Error: not found
unable to find package 'MDB2_Schema_Validate' file 'MDB2/Schema/Validate.php'

The package appears to be there in my PEAR structure  
(/usr/share/pear/MDB2/), but not in the one contained within the horde  
distribution (<horde_root>/pear/MDB2/).

Can anyone offer any suggestion as to why this might be breaking?

Thanks,
--Chris
_______________________________________________________________________________
Chris Funk                                      CFunk at CompleteComputing.com
Complete Computing Services                     www.CompleteComputing.com
800.227.2717
918 Lamonte Ln
Houston, Texas 77018