Facebook App : This must be derived from Canvas URL, Secure Canvas URL

Question

Hi I wan't to create a facebook app to use it for the auth in my new site locally installed(my machine),but from yesterday I don't succeed to install it and use it, all time I have this very strange error when I wan't write a domain in the "App Domains" :

This must be derived from Canvas URL, Secure Canvas URL, Site URL, Mobile Site URL, Page Tab URL or Secure Page Tab URL. Check and correct the following domains

the domain of my application is http://localhost/project/app_dev.php/ it dosn't work I change it by a real url such as : http://www.exemple.com/,but I had the same error,and just I notice that I see this error when I create an app with new look of facebook (yesterday)...

Answer 1

In my case the problem was I hadn't completed the "+ Add Platform > Website" section. Once I did that the contents of App Domains became valid and the error went away.