Fatal error: Uncaught Symfony\Component\Form\Exception\LogicException: A form with an empty name cannot have a parent form. in /websrv/sw/php/include/symfony/symfony-7.3/vendor/symfony/symfony/src/Symfony/Component/Form/Form.php:226 Stack trace: #0 /websrv/sw/php/include/symfony/symfony-7.3/vendor/symfony/symfony/src/Symfony/Component/Form/Form.php(746): Symfony\Component\Form\Form->setParent() #1 /websrv/sw/php/include/symfony/symfony-7.3/vendor/symfony/symfony/src/Symfony/Component/Form/FormBuilder.php(166): Symfony\Component\Form\Form->add() #2 /websrv/sw/php/include/symfony/symfony-7.3/vendor/symfony/symfony/src/Symfony/Component/Form/FormBuilder.php(166): Symfony\Component\Form\FormBuilder->getForm() #3 /websrv/zs-2001/htdocs/e-learning/anmeldung_nwt2016.php(4517): Symfony\Component\Form\FormBuilder->getForm() #4 {main} thrown in /websrv/sw/php/include/symfony/symfony-7.3/vendor/symfony/symfony/src/Symfony/Component/Form/Form.php on line 226