Adding custom form field errors within controllers in Symfony

Every field in Symfony now is an instance of a form object.  To add custom errors in the controller upon form submission, you have to access the form object of the field then add the custom error to it.

$error = new formerror("Your field custom error message here.");

//You will need to include the formerror class at the top of the file:

use Symfony\Component\Form\FormError

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