Fatal error: Uncaught Error: Interface "Psr\Http\Message\StreamInterface" not found in D:\xampp\htdocs\ssw_doc\vendor\mpdf\psr-http-message-shim\src\Stream.php:8 Stack trace: #0 {main} thrown in D:\xampp\htdocs\ssw_doc\vendor\mpdf\psr-http-message-shim\src\Stream.php on line 8