Fatal error: Uncaught Error: Interface 'ultracart\v2\models\ModelInterface' not found in /home/dvidiv74/public_html/comp-life/vendor/ultracart/rest_api_v2_sdk_php/lib/models/EmailListSubscribeResponse.php:42 Stack trace: #0 {main} thrown in /home/dvidiv74/public_html/comp-life/vendor/ultracart/rest_api_v2_sdk_php/lib/models/EmailListSubscribeResponse.php on line 42