i get this error in console skel is not defined at main.js

Question

i uplaod my site to cpanel butits not opend and i get this error in my console :

Uncaught ReferenceError: skel is not defined at main.js:10:5 at main.js:114:3

and when i open main.js file i get this lines :

(function($) {

    skel.breakpoints({
        xlarge: '(max-width: 1680px)',
        large: '(max-width: 1280px)',
        medium: '(max-width: 1024px)',
        small: '(max-width: 736px)',
        xsmall: '(max-width: 480px)'
    });

note that the website is working in my pc .