How can I fix the error “Given URL is not allowed by the Application configuration” when trying to use Facebook app on my website?

January 29, 2014
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I tried to place Facebook Login App on two places on my website. Now the app is no longer working. The message is as follows:
Given URL is not allowed 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 App’s domains.

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