Fatal error: Uncaught Error: Class "Doctrine\ORM\Query\AST\Functions\FunctionNode" not found in /srv/disk3/2724534/www/redgraveresearch.com/concrete/vendor/doctrine/orm/lib/Doctrine/ORM/Query/AST/Functions/SubstringFunction.php:18 Stack trace: #0 {main} thrown in /srv/disk3/2724534/www/redgraveresearch.com/concrete/vendor/doctrine/orm/lib/Doctrine/ORM/Query/AST/Functions/SubstringFunction.php on line 18