Hi verclytte,

Can you try re-authenticate your facebook (Autoposting>Facebook)
1. Revoke access : https://www.screencast.com/t/OjM7lwNJ and sign in with Facebook : https://www.screencast.com/t/vLqiMyd3CDI2

reference: https://developers.facebook.com/blog/post/2011/05/13/how-to--handle-expired-access-tokens/

I did the procedure but I still have the problem

Hi verclytte,

Can you download the attached file and replace it in the folder:
.../administrator/components/com_easyblog/includes/oauth/adapters/facebook/client.php
.../administrator/components/com_easyblog/controllers/facebook.php
as because I'm unable to paste into your FTP
and give it another try.

You're suggested to backup the file that you want to replace beforehand for precaution