How to get old validation errors

You should pass the error messages during the redirect, using "with($name, $content)", e.g.: https://codeigniter4.github.io/userguide...l#redirect

Ok. Thank you! But why they are saved as flash data?

PHP Code:

$validator = Services::validation();
if (! empty($validator->getErrors()))
{
    $session->setFlashdata('_ci_validation_errors', serialize($validator->getErrors()));
}