Redirecting to authentication dialog - "An error occurred. Please try again later"

I have had the same problem as you.

From the Facebook Developers Apps page, make sure that the Sandbox Mode is disabled.

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I had the same problem after changing the domain of my site. Altough I properly changed the request_uri parameter and updated my app settings with the new domain, the error kept showing up. Then I realized that the ID and the SECRET ID of my Facebook APP had automatically changed with no warning!! The whole thing started working again using the new ID.