Fatal error: Uncaught Symfony\Component\Debug\Exception\FatalThrowableError: Parse error: syntax error, unexpected '??' (T_COALESCE), expecting '(' in /srv/app/www/src/AppBundle/Entity/Traits/Attribute/ProductSuperfamilyDBExtensionConnectorTrait.php:536 Stack trace: #0 /srv/app/www/vendor/composer/ClassLoader.php(322): Composer\Autoload\includeFile('/srv/app/www/ve...') #1 [internal function]: Composer\Autoload\ClassLoader->loadClass('AppBundle\\Entit...') #2 /srv/app/www/src/AppBundle/Entity/ProductSuperfamily.php(41): spl_autoload_call('AppBundle\\Entit...') #3 /srv/app/www/vendor/composer/ClassLoader.php(444): include('/srv/app/www/sr...') #4 /srv/app/www/vendor/composer/ClassLoader.php(322): Composer\Autoload\includeFile('/srv/app/www/ve...') #5 [internal function]: Composer\Autoload\ClassLoader->loadClass('AppBundle\\Entit...') #6 [internal function]: spl_autoload_call('AppBundle\\Entit...') #7 /srv/app/www/vendor/doctrine/common/lib/Doctrine/Common/ClassLoader.php(276): class_exists('AppBundle\\Entit...', true) #8 / in /srv/app/www/src/AppBundle/Entity/Traits/Attribute/ProductSuperfamilyDBExtensionConnectorTrait.php on line 536