Profile: Eso

add_filter('cred_form_validate','my_validation',10,2);
function my_validation($error_fields, $form_data)
{
    //field data are field values and errors
    list($fields,$errors)=$error_fields;
    //uncomment this if you want to print the field values
    //print_r($fields);
    //validate if specific form
    if ($form_data['id']==12)
    {
 
        //check if featured image exists
        if (empty($fields['_featured_image']['value']))
        {
            //set error message for featured image
            $errors['_featured_image'] = 'Missing featured image';
        }
    }
    //return result
    return array($fields,$errors);
}