how to limit the number of rows of a textarea-field

Hi,

I found the thread https://kriesi.at/support/topic/forms-how-to-limit-number-of-rows-in-message-text-imput-window/ for this topic and made the steps described in there.

But I get the error “No direct script access allowed” when I add following code in the functions.php of the enfold child theme: require_once( ‘class-form-generator.php’ );

I deleted the codeline in functions.php and created the folder framework/php and put there the changed file.
But this has no influence.

What I have to do, that the change of the row will effect the contact-form.

Best regards,
Daniela