Fatal error: Uncaught Error: Interface "GuzzleHttp\ClientInterface" not found in /home/slsiluser/public_html/service-portal-mobile-responsive/vendor/guzzlehttp/guzzle/src/Client.php:17 Stack trace: #0 {main} thrown in /home/slsiluser/public_html/service-portal-mobile-responsive/vendor/guzzlehttp/guzzle/src/Client.php on line 17