Facebook Like - Shows 401 Unauthorized Error

I am adding ShareThis widget. When i try to like the page it gives me an Error

Hard to say with that little information, but i am pretty sure the URL you want to share includes authorization. Shared/Liked URLs should always be public, or Facebook can't access the Open Graph data (obviously).

Edit: I just debugged the domain and while there is no authorization, you do get that error. So i would assume it´s a bug. Here is where you can debug URLs and refresh their OG tags: https://developers.facebook.com/tools/debug

I did refresh the tags and the error did not disappear, so you should consider filing a bug: https://developers.facebook.com/bugs/