This question has been asked many times previously, but, recently the Facebook developers website has apparently changed and therefore, the solution isn't available anywhere.
Here's what the problem looks like:
(Sorry, the application you were using is misconfigured. Please try again later.)
Now, the following this the app settings page:
i.e, there's no option to set canvas url or secure canvas url. What should I do to rectify this problem?
If you have access to Facebook Canvas, you'll find it by going to your Facebook page and looking under Publishing Tools. You should see it at the bottom of your left sidebar menu. See if you have Canvas in your Facebook Page Publishing Tools.
To get started using Canvas, visit your page's Publishing Tools, and then select “Canvas” and click on the button to create a new Canvas. Because Canvas is a new feature, it is worth your time to go through especially the Tips and Examples sections so that you can get more information about what Canvas can do.
In Facebook's words, Canvas is “a full-screen ad experience built for bringing brands and products to life on mobile.” It allows advertisers to deliver fully immersive, interactive ads that are hosted completely on Facebook — thereby eliminating the need for users to click out of the app to engage with mobile content.
Facebook Instant Experiences, formerly known as Canvas Ads, help you create beautiful, mobile experiences for your ads. Designed to capture your audience's attention, they load instantly and have proven to drive better business outcomes.
I don't have this new dashboard UI yet but look under that "Add Platform" button for something along the lines of "App on Facebook"
I had the same problem. You should add App on Facebook platform in your Settings tab.
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