https://www.YOURDOMAIN.com/index.php?option=com_jfbconnect&task=authenticate.callback&provider=facebook
Generally the cause for this error is because the app is set up for the wrong type of app. It should be 'Web'. In the Facebook Developer > your app > Settings > Advanced tab, please ensure that the "Native or desktop app?" setting is set to NoFacebook API Error: (#15) This method must be called with an app access_token.
http://solterascristianas.com/index.php?option=com_jfbconnect&task=authenticate.callback&provider=facebook
http://www.solterascristianas.com/index.php?option=com_jfbconnect&task=authenticate.callback&provider=facebook
https://solterascristianas.com/index.php?option=com_jfbconnect&task=authenticate.callback&provider=facebook
https://www.solterascristianas.com/index.php?option=com_jfbconnect&task=authenticate.callback&provider=facebook
In JFBConnect backend, please open Autotune. Go to the Facebook Application tab. There is a refresh button in our toolbar that should hopefully clear up the expiration.Other thing, the sourcecoast subscribe id is still expired, can you check that?
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