I am developing an Unity game for Facebook Canvas. I am using the Facebook Webhosting product. Everything is setup on in the app settings both in game and on the developer's app page, but when I try to load the game by using the Facebook Web Games Page URL I get the following error: "The requested URL was not found on this server" (please see the attached picture).
[What could it be the problem? I followed every step in setting up the project, the page, the Webhosting product (https://developers.facebook.com/docs/games/services/contenthosting).