Fatal error: Uncaught Error: Class 'Symfony\Component\Form\AbstractTypeExtension' not found in /home/lafaamicps/www/symfony/vendor/braincrafted/bootstrap-bundle/Braincrafted/Bundle/BootstrapBundle/Form/Extension/InputGroupButtonExtension.php:23 Stack trace: #0 {main} thrown in /home/lafaamicps/www/symfony/vendor/braincrafted/bootstrap-bundle/Braincrafted/Bundle/BootstrapBundle/Form/Extension/InputGroupButtonExtension.php on line 23