Second Custom Post Type

Hello, I have made a custom post type using the following code

add_action( 'init', 'register_cpt_tutorial' );

function register_cpt_tutorial() {

    $labels = array(
        'name' => _x( 'Tutorials', 'tutorial' ),
        'singular_name' => _x( 'Tutorial', 'tutorial' ),
        'add_new' => _x( 'Add New', 'tutorial' ),
        'add_new_item' => _x( 'Add New Tutorial', 'tutorial' ),
        'edit_item' => _x( 'Edit Tutorial', 'tutorial' ),
        'new_item' => _x( 'New Tutorial', 'tutorial' ),
        'view_item' => _x( 'View Tutorial', 'tutorial' ),
        'search_items' => _x( 'Search Tutorials', 'tutorial' ),
        'not_found' => _x( 'No tutorials found', 'tutorial' ),
        'not_found_in_trash' => _x( 'No tutorials found in Trash', 'tutorial' ),
        'parent_item_colon' => _x( 'Parent Tutorial:', 'tutorial' ),
        'menu_name' => _x( 'Tutorials', 'tutorial' ),
    );

    $args = array(
        'labels' => $labels,
        'hierarchical' => false,
        'description' => 'Tutorials description will be here',
        'supports' => array( 'title', 'editor', 'thumbnail', 'comments' ),
        'taxonomies' => array( 'category' ),
        'public' => true,
        'show_ui' => true,
        'show_in_menu' => true,
        'menu_position' => 20,

        'show_in_nav_menus' => true,
        'publicly_queryable' => true,
        'exclude_from_search' => false,
        'has_archive' => true,
        'query_var' => true,
        'can_export' => true,
        'rewrite' => true,
        'capability_type' => 'post'
    );

    register_post_type( 'tutorial', $args );
}

If I copy and paste this code and change all of the tutorials to videos, it does not work, can someone tell me why?

Thanks