Problem adding and running new type of page

[mertburakd]

When adding a new page type, I can create a new page in Simple Page type with the manager, but the page content I created is completely empty and when I try to add a view by specifying the route, the references of the objects are empty. When I look at the database, I see that I can save the type and content. (We are using MVC version 9.0.0.)