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