Warning: Unsupported declare 'strict_types' in /var/www/devel/md/product-db/vendor/guzzlehttp/promises/src/CancellationException.php on line 3

Fatal error: Class 'GuzzleHttp\Promise\RejectionException' not found in /var/www/devel/md/product-db/vendor/guzzlehttp/promises/src/CancellationException.php on line 11