Fatal error: Uncaught Error: Class 'Facebook\Authentication\OAuth2Client' not found in /home/seotool/public_html/core/library/facebook/Facebook.php:196 Stack trace: #0 /home/seotool/public_html/core/library/facebook/Facebook.php(284): Facebook\Facebook->getOAuth2Client() #1 /home/seotool/public_html/core/controllers/facebook.php(44): Facebook\Facebook->getRedirectLoginHelper() #2 /home/seotool/public_html/core/app.php(154): require('/home/seotool/p...') #3 /home/seotool/public_html/index.php(25): require('/home/seotool/p...') #4 {main} thrown in /home/seotool/public_html/core/library/facebook/Facebook.php on line 196