Facebook API error code 191 [duplicate]

Question

Possible Duplicate:
Facebook API error 191

I'm developing a Facebook app. When I attempt to get an access token, I get the following message:

An error occurred with test. Please try again later.

API Error Code: 191
API Error Description: The specified URL is not owned by the application
Error Message: Invalid redirect_uri: Given URL is not allowed by the Application configuration.

https://developers.facebook.com/apps/.../summary

I've configured the app's domain (appsdot.xxx.com), name and other attributes.

What is causing this error, and how do I fix it?

Answer 1

The redirect_uri must contain the Site URL or Canvas URL as defined in your App Settings. I always get this error when I set a redirect_uri that doesn't contain the URLs in App Settings.

Answer 2

I got this error because I had a trailing slash on my Canvas URL and neglected to include the trailing slash in the redirect_uri.