Fatal error: Uncaught Error: Interface 'Hamcrest\SelfDescribing' not found in /mnt/volume_lon1_01/backend/admin/vendor/hamcrest/hamcrest-php/tests/Hamcrest/StringDescriptionTest.php:6 Stack trace: #0 {main} thrown in /mnt/volume_lon1_01/backend/admin/vendor/hamcrest/hamcrest-php/tests/Hamcrest/StringDescriptionTest.php on line 6