not working for facebook and support requests deleted

not working for facbook login and when i submit a support request it is instantly deleted without any explanation.

when i or any of my users try to log in using facebook the site displays get this text: Fatal error: Class ‘BaseFacebook’ not found in /home/oliveboa/public_html/wp-content/plugins/wordpress-social-login/hybridauth/Hybrid/Providers/Facebook.php on line 34