Warning: Invalid argument supplied for foreach() in

Warning: Invalid argument supplied for foreach() in /home/musculof/musculofuncional.pt/wp-content/plugins/cartflows/woocommerce/template/checkout/form-shipping.php on line 62

This alert appeared and I don’t know why on the checkout page of woocommerce with cartflow, could someone help me find the solution?

these are the lines of the php code that appear in the alert:

<div class="woocommerce-additional-fields__field-wrapper">
     <?php foreach ( $checkout->get_checkout_fields( 'order' ) as $key => $field ) : ?>
     <?php woocommerce_form_field( $key, $field, $checkout->get_value( $key ) ); ?>
			<?php endforeach; ?>
		</div>

The page I need help with: [log in to see the link]