Perl Sections: command_rec for directive `ISA' not found!

[Renaud Waldura]

I recently upgraded a system to FreeBSD 4.2, Apache 1.3.19, mod_perl 1.25.
We use Perl sections to configure virtual hosts from a database; the vhosts
data is stored in a table, we select it with DBI and configure Apache from
within a Perl section.

This configuration process now fails with: "command_rec for directive `ISA'
not found! ". The error occurs on this statement:

$dbh = DBI->connect();

Any ideas?

--Renaud