I have modified a js variable function in my custom module. It works in localhost without any issue but doesn't work on server.

The code is below:

odoo.define('cof_website_big_menu.big_menu_custom', function (require) {
    'use strict';
    var EditMenuDialog = require('website.contentMenu').EditMenuDialog;
    EditMenuDialog.include({
        start: function () {
            var r = this._super.apply(this, arguments);
            this.$('.oe_menu_editor').nestedSortable({
                listType: 'ul',
                handle: 'div',
                items: 'li',
                maxLevels: 3,
                toleranceElement: '> div',
                forcePlaceholderSize: true,
                opacity: 0.6,
                placeholder: 'oe_menu_placeholder',
                tolerance: 'pointer',
                attribute: 'data-menu-id',
                expression: '()(.+)', // nestedSortable takes the second match of an expression (*sigh*)
            });
            return r;
        }
    });
});

It shows failed module error in the browser console. After further debugging I found following error:

How to solve this?