[TYPO3-mvc] Extbase Form Validation Error

[Ludwig Rafelsberger]

Hi Christian, 
 
> ** An error occurred while trying to call
> Tmd\Screenprinting\Controller\PrintitemController->updateAction()
> 
> How to manipulate/translate this Line?

have a look at the method getErrorFlashMessage(), inherited in your
ActionController (from
\TYPO3\CMS\Extbase\Mvc\Controller\ActionController)

As this methods documentation says: "Override this to customize the
flash message in your action controller." (By default the
getErrorFlashMessage() method just returns the well-known message "An
error occurred while trying to call…" - without any translation).

Cheers, 

Ludwig