Fatal error: Uncaught Error: Class "Symfony\Component\DependencyInjection\Extension\AbstractExtension" not found in /home/indusaviation/public_html/crm/core/backend/DependecyInjection/Migrations/ExtensionMigrationsExtension.php:43 Stack trace: #0 {main} thrown in /home/indusaviation/public_html/crm/core/backend/DependecyInjection/Migrations/ExtensionMigrationsExtension.php on line 43