Fatal error: Uncaught Error: Call to a member function retrieveFileOrFolderObject() on null in /kunden/415525_70794/rp-hosting/5143009/6143009/typo3cms/typo3_src-8.7.18/typo3/sysext/form/Classes/Mvc/Persistence/FormPersistenceManager.php:756 Stack trace: #0 /kunden/415525_70794/rp-hosting/5143009/6143009/typo3cms/typo3_src-8.7.18/typo3/sysext/form/Classes/Mvc/Persistence/FormPersistenceManager.php(142): TYPO3\CMS\Form\Mvc\Persistence\FormPersistenceManager->retrieveFileByPersistenceIdentifier('1:/form/formula...') #1 /kunden/415525_70794/rp-hosting/5143009/6143009/typo3cms/typo3_src-8.7.18/typo3/sysext/form/Classes/Controller/FormFrontendController.php(58): TYPO3\CMS\Form\Mvc\Persistence\FormPersistenceManager->load('1:/form/formula...') #2 [internal function]: TYPO3\CMS\Form\Controller\FormFrontendController->renderAction() #3 /kunden/415525_70794/rp-hosting/5143009/6143009/typo3cms/typo3_src-8.7.18/typo3/sysext/extbase/Classes/Mvc/Controller/ActionController.php(316): call_user_func_array(Array, Array) #4 /kunden/415525 in /kunden/415525_70794/rp-hosting/5143009/6143009/typo3cms/typo3_src-8.7.18/typo3/sysext/form/Classes/Mvc/Persistence/FormPersistenceManager.php on line 756