It doesn't work anymore

When I publish an article on my blog, the add link to facebook doesn’t publish it: The following problem will be displayed: Add link: Facebook error: An unexpected error has occurred. Please retry your request later. @ 2014-05-14T10:56:50+00:00 I don’t know why it comes alway. The plugin is authorisized, to publish the link.

https://wordpress.org/plugins/add-link-to-facebook/