Fatal error: Uncaught Error: Class 'Http\Client\Common\Plugin\SeekableBodyPlugin' not found in /home/opcon/src/composer/vendor/php-http/client-common/src/Plugin/RequestSeekableBodyPlugin.php:16 Stack trace: #0 {main} thrown in /home/opcon/src/composer/vendor/php-http/client-common/src/Plugin/RequestSeekableBodyPlugin.php on line 16