Fatal error: Uncaught Error: Interface "Psr\Http\Message\UriInterface" not found in /home/mdws/public_html/staging/paypal/vendor/guzzlehttp/psr7/src/Uri.php:16 Stack trace: #0 {main} thrown in /home/mdws/public_html/staging/paypal/vendor/guzzlehttp/psr7/src/Uri.php on line 16