First off this is not the Apache administration forum. Some sort of bad-juju happened to your Apache infrastucture and you need to work with your admin to sort it all out.

That said, with the contextual information you have provided there still isn't much to work with here.

my $session = shift;
[download]

Where is this coming from? Is the MySQL database hinted at by the raw error dump up and running and sane? What's in the error logs for the server?