Fatal error: Uncaught Error: Class "Http\Client\Exception\TransferException" not found in /var/www/html1/wp-content/plugins/zettle-pos-integration/vendor/php-http/httplug/src/Exception/RequestException.php:16 Stack trace: #0 {main} thrown in /var/www/html1/wp-content/plugins/zettle-pos-integration/vendor/php-http/httplug/src/Exception/RequestException.php on line 16