Fatal error: Uncaught Error: Class 'Google\Site_Kit\Core\Modules\Module' not found in /home/refref/public_html/google-site-kit/includes/Modules/PageSpeed_Insights.php:39 Stack trace: #0 {main} thrown in /home/refref/public_html/google-site-kit/includes/Modules/PageSpeed_Insights.php on line 39