Fatal error: Uncaught Error: Class 'Google\Site_Kit\Core\Storage\Setting' not found in /home/refref/public_html/google-site-kit/includes/Modules/Sign_In_With_Google/Existing_Client_ID.php:23 Stack trace: #0 {main} thrown in /home/refref/public_html/google-site-kit/includes/Modules/Sign_In_With_Google/Existing_Client_ID.php on line 23