"Use Strict" - Waypoints

When doing the code in jQuery for a website, I came across the error "use strict" . This error happens more exactly in the line 2% with% do not letting it execute. I needed help resolving it if possible.

$(document).ready(function() {
    $('jq--secaaestcb').waypoint(function(direction) {
        if (direction === "down") {
            $('nav').addClass('nav-scroll');
        } else {
            $('nav').removeClass('nav-scroll');
        }
    }, {
      offset: '60px;'
    });
});