Fatal error: Uncaught Error: Class 'craft\gql\base\Mutation' not found in /home/mpolsk5/public_html/visibilityfuel.com/vendor/craftcms/cms/src/gql/mutations/Ping.php:19 Stack trace: #0 {main} thrown in /home/mpolsk5/public_html/visibilityfuel.com/vendor/craftcms/cms/src/gql/mutations/Ping.php on line 19