Could not find driver in Am/Lite.php

Hi, I hope someone can provide some help or point me in the right direction.

Everything was working well with my site, with PHP 5.3, Wordpress 4.3.4, and aMember 5. I'm on a VPS. All of a sudden the website doesn't work anymore and I get the message

Fatal error: could not find driver in /home/my_user_name/public_html/amember/library/Am/Lite.php on line 909

I have this code at the beginning of the wordpress header:

<?php require_once '/home/my_user_name/public_html/amember/library/Am/Lite.php'; ?>

I know the hosting company made some upgrades to the server (as I got a bunch of notification from cPanel last night) and somewhat they changed the PHP version, but for the love of me I can't figure out what to tell them to correct the error.

What are the requirements for library/Am/Lite.php to load correctly?

I know for sure I had PHP 5.3, which they re-compile, but still not working. Is there any specific library that needs to be working?

Thank you for the help!

Max

Never mind. Resolved.