Facebook: The domain of this URL isn't included in the app's domains

I am sharing this page to my facebook: https://www.jerseylillysaloon.com/prescott-events/jersey-lilly-entertainment-schedule-august-9-14/

I get this facebook error:

Can’t Load URL: The domain of this URL isn’t included in the app’s domains. To be able to load this URL, add all domains and subdomains of your app to the App Domains field in your app settings.

This is the URL of the error:

https://www.facebook.com/v2.3/dialog/optin/?app_id=966242223397117&redirect_uri=https%3A%2F%2Fwww.facebook.com%2Fsharer%2Fsharer.php%3Fu%3Dhttp%253A%252F%252Fwww.jerseylillysaloon.com%252Fprescott-events%252Fjersey-lilly-entertainment-schedule-august-9-14%252F%26t%3DJersey%2BLilly%2BEntertainment%2BSchedule%2BAugust%2B9%2B%25E2%2580%2593%2B14%26v%3D3&display=popup

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