Fatal error: Uncaught Error: Class 'Google_Client' not found in /var/www/html/prepdril/application/controllers/googlelogin.php:16 Stack trace: #0 /var/www/html/prepdril/system/core/CodeIgniter.php(359): Googlelogin->login() #1 /var/www/html/prepdril/index.php(211): require_once('/var/www/html/p...') #2 {main} thrown in /var/www/html/prepdril/application/controllers/googlelogin.php on line 16