Fatal error: Uncaught Error: Interface 'Gelf\MessageValidatorInterface' not found in /var/www/html/ng-crm/yiiapp/vendor/graylog2/gelf-php/src/Gelf/MessageValidator.php:22 Stack trace: #0 {main} thrown in /var/www/html/ng-crm/yiiapp/vendor/graylog2/gelf-php/src/Gelf/MessageValidator.php on line 22