Fatal error: Uncaught Error: Class 'ChargeBee_Model' not found in /var/www/alldocs/home/klewis/website_libs/chargebee/lib/ChargeBee/Models/QuoteBillingAddress.php:3 Stack trace: #0 {main} thrown in /var/www/alldocs/home/klewis/website_libs/chargebee/lib/ChargeBee/Models/QuoteBillingAddress.php on line 3