[Sylius] GridHelper::renderGrid() must be an instance of Sylius\Component\Grid\View\GridView, instance of Pagerfanta\Pagerfanta - how to fix

 It means you forgot to put `grid: gridname` into your route configuration. For example:

admin_user_index:

    path: /users

    defaults:

        _controller: app.controller.user::indexAction

        _sylius:

            template: "@AdminBundle/grid/index.html.twig"

            grid: admin_user