How to resolve the error ?:
Deprecated: The third argument to Zend \ Stratigility \ MiddlewarePipe () ($ out) will be required starting with Stratigility version 2; Please see https://docs.zendframework.com/zend-stratigility/migration/to-v2/ for more details on how to update your application to remove this message. In C: \ xampp \ htdocs \ flarum \ vendor \ zendframework \ zend-stratigility \ src \ MiddlewarePipe.php on line 101
Validation.required validation.required
