Fatal error: Uncaught Error: Interface "Zend\Http\Header\HeaderInterface" not found in /home/vincent/http/concrete5/concrete/vendor/zendframework/zend-http/src/Header/Allow.php:19 Stack trace: #0 {main} thrown in /home/vincent/http/concrete5/concrete/vendor/zendframework/zend-http/src/Header/Allow.php on line 19