custom post type not showing in menu

// portfolio code
function codenovo_portfolio_init(){
    $labels = array(
        'name' => _x('Portfolio', 'post type general name'),
        'singular_name' => _x('Portfolio', 'post type singular name'),
        'add_new' => _x('Add New', 'portfolio'),
        'add_new_item' => __('Add New Portfolio'),
        'edit_item' => __('Edit Portfolio'),
        'new_item' => __('New Portfolio'),
        'view_item' => __('View Portfolio'),
        'search_items' => __('Search Portfolio'),
        'not_found' =>  __('No portfolio found'),
        'not_found_in_trash' => __('No portfolio found in Trash'),
        'parent_item_colon' => '',
        'menu_name' => 'Portfolio'
    );

    $args = array(
        'labels' => $labels,
        'public' => true,
        'publicly_queryable' => true,
        'show_ui' => true,
        'show_in_menu' => true,
        'query_var' => true,
        'rewrite' => true,
        'capability_type' => 'post',
        'has_archive' => false,
        'hierarchical' => false,
        'menu_position' => null,
        'supports' => array('title','editor','thumbnail'),
        'rewrite' => array(
            'slug'       => 'portfolio',
            'with_front' => FALSE,
        )
    );
    register_post_type('portfolio',$args);

    $labels = array(
        'name' => _x( 'Portfolio Category', 'taxonomy general name' ),
        'singular_name' => _x( 'Category', 'taxonomy singular name' ),
        'search_items' =>  __( 'Search Types' ),
        'all_items' => __( 'All Category' ),
        'parent_item' => __( 'Parent Category' ),
        'parent_item_colon' => __( 'Parent Category:' ),
        'edit_item' => __( 'Edit Category' ),
        'update_item' => __( 'Update Category' ),
        'add_new_item' => __( 'Add New Category' ),
        'new_item_name' => __( 'New Category Name' ),
    );


    register_taxonomy('portfoliocategory',array('portfolio'), array(
        'hierarchical' => true,
        'labels' => $labels,
        'show_ui' => true,
        'query_var' => true,
        'rewrite' => array( 'slug' => 'portifolio_category' ),
    ));


}
add_action('init', 'codenovo_portfolio_init');