XF 1.5 Error on Facebook posts

[Soundlover]

I am getting an error before the title of my forum when I recommend something from forum or even if I insert a forum link into a facebook post. I have inserted an image that shows the text Error.

 

[Paul B]

You have thread content disabled for guests, so Facebook is unable to retrieve or display it.

 

[Soundlover]

Thank you, that was the problem.