// Custom Post 1
    register_post_type( 'courses',
        array(
            'labels' => array(
                'name' => __( 'Courses' ),
                'singular_name' => __( 'Course' )
            ),
        'public' => true,
        'has_archive' => true,
        'supports' => array('title', 'editor', 'thumbnail'),
        'show_ui' => true
        )
    );
 register_taxonomy('courses_categories', 'courses', ['label' => 'Courses Categories','hierarchical' => true]);

NB! (The hierarchical array item is Important)
,’hierarchical’ => true

Add this line of code at the top of your child theme function. It should get rid of your error. If not good luck debugging 🙂

wp_enqueue_script('jquery');

<?php echo do_shortcode("[shortcode]");  ?>

Inside your themes functions.php add the below snippet and fill out the placeholders.

############################################################################
//////////////////////////////////////
// This is your shortcode. You reference it like you see below with the square brackets.
// [shortcode_name_here]
//////////////////////////////////////
function echo_shortcode_function_name(){
    ob_start();
    include '/path to our file';
    return ob_get_clean();
}
add_shortcode( 'shortcode_name_here', 'echo_shortcode_function_name');
############################################################################

Now reference your shortcode and it should load no issues if your file references are correct.

<?php /* Template Name: any_name.php */ ?>