Fatal error: Uncaught Error: Class 'Guzzle\Http\Message\Header' not found in /app/web/vendor/guzzle/http/Guzzle/Http/Message/Header/CacheControl.php:10 Stack trace: #0 {main} thrown in /app/web/vendor/guzzle/http/Guzzle/Http/Message/Header/CacheControl.php on line 10