Custom Post Type dan Taxonomy

Selamat pagi siang malam mastah

Saya dapet kesulitan nih, single-custom.php saya tidak mau tampil
Cek disini

Sebelumnya saya buat custom post type sama taxonomynya
Mohon dicek, ini codenya

// Register Custom Taxonomy
function portfolio_categories() {

	$labels = array(
		'name'                       => 'Portfolio Categories',
		'singular_name'              => 'Portfolio Categories',
		'menu_name'                  => 'Portfolio Categories',
		'all_items'                  => 'All Items',
		'parent_item'                => 'Parent Item',
		'parent_item_colon'          => 'Parent Item:',
		'new_item_name'              => 'New Item Name',
		'add_new_item'               => 'Add New Item',
		'edit_item'                  => 'Edit Item',
		'update_item'                => 'Update Item',
		'separate_items_with_commas' => 'Separate items with commas',
		'search_items'               => 'Search Items',
		'add_or_remove_items'        => 'Add or remove items',
		'choose_from_most_used'      => 'Choose from the most used items',
		'not_found'                  => 'Not Found',
	);
	$args = array(
		'labels'                     => $labels,
		'hierarchical'               => true,
		'public'                     => true,
		'show_ui'                    => true,
		'show_admin_column'          => true,
		'show_in_nav_menus'          => true,
		'show_tagcloud'              => true,
		'rewrite'              		 => array( 'slug' => 'portfolio' ),
	);
	register_taxonomy( 'portfolio-categories', array( 'portfolio' ), $args );

}

// Hook into the 'init' action
add_action( 'init', 'portfolio_categories', 0 );

// Register Custom Post Type
function portfolio_post_type() {

	$labels = array(
		'name'                => 'Portfolio',
		'singular_name'       => 'Portfolio',
		'menu_name'           => 'Portfolio',
		'parent_item_colon'   => 'Parent Item:',
		'all_items'           => 'All Items',
		'view_item'           => 'View Item',
		'add_new_item'        => 'Add New Item',
		'add_new'             => 'Add New',
		'edit_item'           => 'Edit Item',
		'update_item'         => 'Update Item',
		'search_items'        => 'Search Item',
		'not_found'           => 'Not found',
		'not_found_in_trash'  => 'Not found in Trash',
	);
	$args = array(
		'label'               => 'portfolio',
		'description'         => 'Portfolio',
		'labels'              => $labels,
		'supports'            => array( 'title', 'editor', 'excerpt', 'thumbnail', 'comments', ),
		'taxonomies'          => array( 'portfolio' ),
		'hierarchical'        => false,
		'public'              => true,
		'show_ui'             => true,
		'show_in_menu'        => true,
		'show_in_nav_menus'   => true,
		'show_in_admin_bar'   => true,
		'menu_position'       => 5,
		'can_export'          => true,
		'has_archive'         => true,
		'exclude_from_search' => false,
		'publicly_queryable'  => true,
		'capability_type'     => 'post',
	);
	register_post_type( 'portfolio', $args );

}
add_theme_support( 'post-thumbnails' );

if ( function_exists( 'add_image_size' ) ) { 

	add_image_size( 'thumb-2', 250, 250, array( top, left ) );

}

// Hook into the 'init' action
add_action( 'init', 'portfolio_post_type', 0 );

Minta solusinya mastah ?