I am declaring the method as follows.
public function beforeRender(EventInterface $event)
It is showing the following error
Declaration of App\Controller\AppController::beforeRender(App\Controller\EventInterface $event) should be compatible with Cake\Controller\Controller::beforeRender(Cake\Event\EventInterface $event)
Is there a problem when declaring the function? If so what?
It looks like it’s applying the wrong EventInterface, perhaps drawn from the order of your uses at the top. If you hardcode the full path to the class its expecting it should be good. Something like
public function beforeRender(Cake\Event\EventInterface $event)
Almost certainly, you just haven’t included
use Cake\Event\EventInterface;
at the top of your controller file, so when you say “EventInterface” in the function declaration, it is assuming it’s in the current namespace, i.e. App\Controller.