Add link: Facebook error: (#1) An unknown error occurred

Unknown errors are hard to diagnose. Try to authorize the plugin again by pressing the authorize button on the plugin settings page. Clear errors if needed (see the FAQ for how to). If authorizing again doesn’t resolve the problem, remove the Facebook App ID & Secret from the plugin settings page and setup the plugin again by following the setup guide (under ‘other notes’ on wordpress.org). You can use the same Facebook app or create a new one.

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