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.
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.
This was happening to me also but all the api keys, secrets and stuff were correct. What I found is that my app was running in sandbox mode. Go to your app settings in https://developers.facebook.com/ click the advanced settings tab and check to see if your app is in sandbox mode. If it is disable it and try again. Let us know if it works.