Fatal error: Uncaught Error: Class "Magento\GoogleTagManager\Block\ListJson" not found in /var/www/magento/html/app/code/BBNT/GoogleTagManager/Block/ListJson.php:12 Stack trace: #0 {main} thrown in /var/www/magento/html/app/code/BBNT/GoogleTagManager/Block/ListJson.php on line 12