Uncaught TypeError: $ (...) .removeClass (...) .affix is not a function at HTMLDocument.anonymous

I have the problem in jQuery, it tells me that affix is not a function, I already did everything I know and more and even then I could not solve it .. can you help me?

jQuery(document).ready(function($){
    if ( ($(window).height() + 100) < $(document).height() ) {
        $('#cta-buttons-wrapper').removeClass('hidden').affix({
            offset: {
                top: 100
            }
        });
    }

});