Fatal error: Uncaught Error: Class 'OpenCloud\ObjectStore\Upload\AbstractTransfer' not found in /home/app/htdocs/ninja/vendor/rackspace/php-opencloud/lib/OpenCloud/ObjectStore/Upload/ConcurrentTransfer.php:30 Stack trace: #0 {main} thrown in /home/app/htdocs/ninja/vendor/rackspace/php-opencloud/lib/OpenCloud/ObjectStore/Upload/ConcurrentTransfer.php on line 30