Fatal error: Uncaught Error: Class 'QuickBooksOnline\API\Core\Http\Serialization\AbstractEntity' not found in /home/uralbox/public_html/vendor/quickbooks/v3-php-sdk/src/Core/Http/Serialization/SimpleEntity.php:7 Stack trace: #0 {main} thrown in /home/uralbox/public_html/vendor/quickbooks/v3-php-sdk/src/Core/Http/Serialization/SimpleEntity.php on line 7