in reply to Re^2: failure to require an installed module + eval fails to trap?
in thread failure to require an installed module + eval fails to trap?

I think tye has picked it.
$sessionClass is presumably the string 'Apache::Session::Postgres', but it needs to be the string 'Apache/Session/Postgres.pm'.
At least, the error message implies that there's a require 'Apache::Session::Postgres' being done somewhere ... and that needs to be changed to require 'Apache/Session/Postgres.pm'

Cheers,
Rob