Authorisation error

We’ve done the whole get client secret thing and everything, exactly as the instructions say and we get the following error when trying to save the widget:

“{“code”: 400, “error_type”: “OAuthException”, “error_message”: “Redirect URI does not match registered redirect URI”}”

Here’s a screenshot of the redirect settings: http://cl.ly/image/3w3E042T0d0i

http://wordpress.org/extend/plugins/instagram-for-wordpress/