Uncaught ReferenceError: PerfectScrollbar is not defined

Uncaught ReferenceError: PerfectScrollbar is not defined
    at HTMLDivElement.<anonymous> (main.min.js:35:13)
    at Function.each (jquery.min.js:2:2777)
    at k.fn.init.each (jquery.min.js:2:1419)
    at HTMLDocument.<anonymous> (main.min.js:34:28)
    at e (jquery.min.js:2:29453)
    at t (jquery.min.js:2:29755)

注掉<script type="text/javascript" src="js/main.min.js"></script>