Fatal error: Uncaught Error: Class 'Model' not found in /var/www/alldocs/home/cmckay/website_libs/chargebee_ProdCatalog_2.0/V3.17.0/lib/ChargeBee/Models/Invoice.php:2 Stack trace: #0 {main} thrown in /var/www/alldocs/home/cmckay/website_libs/chargebee_ProdCatalog_2.0/V3.17.0/lib/ChargeBee/Models/Invoice.php on line 2