Trouble with add_menu_page function

Hello. I am having an issue with add_menu_page(). My Page output is not showing, where it should be I am getting an error:

Warning: call_user_func_array() expects parameter 1 to be a valid callback, first array member is not a valid class name or object in /home/content/45/8909445/html/clients/ereading/wp-includes/plugin.php on line 470

I know add_action() uses PHP’s native call_user_func_array() so I guess that might have something to do with it. Below is my code for creating the menu page and the page output function (Currently I just wanted to echo some text):

public static function register_wpidSwiper_menu_page() {
            add_menu_page('iDangerous Swiper Slides', 'Homepage Slides', 'manage_options',
                    'wp_idangerous_swiper', array( $this, 'admin_page_output'),
                        plugins_url( 'wp-idangerous-swiper/img/swiper-icon.png' ));
        }

        public function admin_page_output() {
            //Create markup for admin page
            echo "Hello iDangerous Swiper";
        }

I am calling this in my classes constructor:

public function __construct() {
            add_action( 'admin_menu', array( $this, 'register_wpidSwiper_menu_page' ) );
        }

My menu item appears in the side menu, with my custom icon, but when I click to go to the page the page displays the error I mentioned above instead of the string I echo in my admin_page_output() method.

Anyone know where this is going wrong for me?

Thanks!
Isaac