GDPR compliant

I created a plugin like described in your docs to check PII a field as containing personally identifiable information (PII).
When I activate the plugin I have following error code:

Fatal error: Uncaught Error: Call to undefined method Caldera_Forms_Field_Util::is_personally_identifying() in /data/sites/web/huyzediemaenebe/www/wp-content/plugins/field.php:11 Stack trace: #0 /data/sites/web/huyzediemaenebe/www/wp-admin/includes/plugin.php(1897): include() #1 /data/sites/web/huyzediemaenebe/www/wp-admin/plugins.php(172): plugin_sandbox_scrape(‘field.php’) #2 {main} thrown in /data/sites/web/huyzediemaenebe/www/wp-content/plugins/field.php on line 11

Here is the code of my plugin:

<?php
/*
* Plugin Name: Caldera Forms PII
*/
//Get Form
//IMPORTANT: change form ID
$form_id = ‘cf5ae9bcda7c5e7’;
$form = Caldera_Forms_Forms::get_form( $form_id );

//Check if field is personally identifying, by field ID
$is_personally_identifying = Caldera_Forms_Field_Util::is_personally_identifying( ‘fld_6009157′, $form );
//Check if field is personally identifying, by field slug
$is_personally_identifying = Caldera_Forms_Field_Util::is_personally_identifying( Caldera_Forms_Field_Util::get_field_by_slug( ’email_address’, $form ), $form );