Why do I get an error when trying to share quizs on Facebook

Anonymous April 21, 2014
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I have a problem with completing online quizs shared on Facebook.

When I click the share button I sometimes get this error on the Facebook page.

“Given URL is not permitted by the application configuration.: One or more of the given URLs is not allowed by the App’s settings. It must match the Website URL or Canvas URL, or the domain must be a subdomain of one of the Apps domains”

Why does this error happen and what can I do about it?