Unable to run JS file in custom WordPress theme

I’m in the process of converting a Bootstrap template into a WordPress theme, and I’ve got all of my stylesheets and scripts referenced in functions.php, and a few initialization codes in footer.php, but there’s one particular file that’s not executing correctly: http://blackrockdigital.github.io/startbootstrap-creative/js/creative.js.

Script:

(function($) {
    "use strict"; // Start of use strict

    // jQuery for page scrolling feature - requires jQuery Easing plugin
    $('a.page-scroll').bind('click', function(event) {
        var $anchor = $(this);
        $('html, body').stop().animate({
            scrollTop: ($($anchor.attr('href')).offset().top - 50)
        }, 1250, 'easeInOutExpo');
        event.preventDefault();
    });

    // Highlight the top nav as scrolling occurs
    $('body').scrollspy({
        target: '.navbar-fixed-top',
        offset: 51
    })

    // Closes the Responsive Menu on Menu Item Click
    $('.navbar-collapse ul li a:not(.dropdown-toggle)').click(function() {
        $('.navbar-toggle:visible').click();
    });

    // Fit Text Plugin for Main Header
    $("h1").fitText(
        1.2, {
            minFontSize: '35px',
            maxFontSize: '65px'
        }
    );

    // Offset for Main Navigation
    $('#mainNav').affix({
        offset: {
            top: 100
        }
    })

    // Initialize WOW.js Scrolling Animations
    new WOW().init();

})(jQuery); // End of use strict

I’ve set this particular file to use jQuery and to be called before the </body> tag via functions.php, but none of the scripts inside are executing and Chrome is returning this error:

Uncaught TypeError: $(...).scrollspy is not a function

I’ve tried replacing the $ alias with jQuery, but it had no effect. I’ve also confirmed this is getting called after the jQuery library.

Any help would be really appreciated. Thanks!