If my facebook application is misconfigured, how do I find out more?

Question

My facebook app simply has apprequests raised from my site via FB.ui. Unfortunately clicking the request notification yields:

Sorry, the application you were using is misconfigured. Please try again later.

How do I find out where the misconfiguration lies?

Solution

In facebook, under app roles, give app admin rights to the account which receives the notification. (I set up a test FB account for this).

It then gives you extra information e.g.