//Listen to Gravity Form hooks:
//get the validation message
add_filter( 'gform_validation_message', 'gform_validation_message', 10, 2 );
//get the form just before it is displayed to the user
add_filter( 'gform_get_form_filter', 'gform_get_form_filter', 10, 2 );
 
//This is where we store the validation message between events
$_message = null;
 
/**
 * Store validation message and return empty string.
 * @param string $message
 * @param GravityForm::FormObject $form
 * @return string
 */
function gform_validation_message($message, $form)  use ($_message) {
    $_message = $message;
 
    //we return an empty string because we don't want the validation message to show in the form any more.
    return '';
}
 
/**
 * Move notification error above pagination
 * @param string $form_string
 * @param GravityForm::FormObject $form
 * @return string
 */
function gform_get_form_filter($form_string, $form )  use ($_message){
    //If there are no validation messages, just show the form
    if(is_null($_message)) {
        return $form_string;
    }
 
    //Load the generated form into a DomDocument so we can insert the validation messages above the pagination steps.
    $doc = new \DOMDocument();
    $doc->loadHTML($form_string);
    $doc->preserveWhiteSpace = false;
 
    //Here is our pagination control
    $el = $doc->getElementById('gf_page_steps_' . $form['id']);
 
    //Create a new DomDocument holding our generated message
    $tmpDoc = new \DOMDocument();
    $tmpDoc->loadHTML($_message);
    foreach ($tmpDoc->getElementsByTagName('body')->item(0)->childNodes as $node) {
        $node = $el->ownerDocument->importNode($node, true);
        //insert our validation messages before the pagination control
        $el->parentNode->insertBefore($node, $el);
    }
 
    $doc->formatOutput = true;
 
    //return our modified HTML :)
    return $doc->saveHTML();
}