I got this explanation regarding a similar product for Wordpress that I use:
Facebook Event API restriction issue?
Facebook has restricted API due to recent privacy issue. So Event API is also get restricted and our plugin fetching events from Facebook is affected with many leading company using Facebook Event API.
Facebook is updating API & policies to use API. They are launching updated API with new approval process which is complex so it will take time to get approved in it. We are already trying our best to get approved so our plugin start working again.
What would have been nice is if the JUX team could let us know if they have implemented the updated API in their module, and started the process with Facebook to get it approved!
I recently purchased the module and it was working fine for just 2 days prior to Facebook implementing the change. As there were no updates being posted by JoomlaUX I requested a refund via Paypal, and I did give them the opportunity to give me a fix time for the module to be updated and working again, but they just gave me the refund, so I think this module has been dumped on the scrap heap.
I'm sorry for the reply later
But facebook is blocking access to the API so we're still trying to figure out a solution
We will try to fix the problem and issue the update as soon as possible
Hope you understand and look forward to receiving sympathy
Thank you for the feedback
We are trying to fix the problem, cause the Facebook API is more secure so it is difficult to access the API
We will notify you as soon as we issue a new update to fix the problem