Add custom post type to gallery display

Hi,

I have a custom post type named “hexon_voertuig” and i want to display the posts with this type in a gallery. Found a solution ons this support forum and added the following code to function.php, but no luck.

<?php

/*
* Add your own functions here. You can also copy some of the theme functions into this file. 
* WordPress will use those functions instead of the original functions then.
*/

/* to support displaying custom post types */

add_theme_support(‘add_avia_builder_post_type_option’);
add_theme_support(‘avia_template_builder_custom_post_type_grid’);

/* to display advanced portfolio setting */

add_filter(‘avf_builder_boxes’,’enable_boxes_on_posts’);
function enable_boxes_on_posts($boxes) {
$boxes[] = array( ‘title’ =>__(‘Avia Layout Builder’,’avia_framework’ ), ‘id’=>’avia_builder’, ‘page’=>array(‘portfolio’, ‘page’, ‘post’,’hexon_voertuig’), ‘context’=>’normal’, ‘expandable’=>true );
$boxes[] = array( ‘title’ =>__(‘Layout’,’avia_framework’ ), ‘id’=>’layout’, ‘page’=>array(‘portfolio’, ‘page’, ‘post’, ‘hexon_voertuig’), ‘context’=>’side’, ‘priority’=>’low’);
$boxes[] = array( ‘title’ =>__(‘Additional Portfolio Settings’,’avia_framework’ ), ‘id’=>’preview’, ‘page’=>array(‘portfolio’, ‘hexon_voertuig’), ‘context’=>’normal’, ‘priority’=>’high’ );

return $boxes;
}
?>

What is wrong with the code?
Regards Freek