Heroku Local cannot find module /loader.js

// Required
const express = require('express');
const bodyParser = require('body-parser');
const cookieParser = require('cookie-parser');
const Chart = require('chart.js');

// vars
const router = express.Router();
let port = process.env.PORT;
if (port == null || port == "") {
  port = 3000;
}

const app = express();

app.use(bodyParser.urlencoded({extended: false}));
app.use(cookieParser());
app.use('/static', express.static('public'));

// Pug Enabled ?
app.set('view engine', 'pug');

// Routes
const mainRoutes = require('./routes');

app.get("/", function(req, res){
    res.render('chargingBoy');
    res.end();
});

app.get("/login", function(req, res){
    res.render('login');
    res.end();
});

app.get("/reports", function(req, res){
    res.render('reports');
    res.end();
});

app.post("/login", function(req, res){
    res.redirect("/");
    res.end();
})

// app.post("/", function(req, res){
//     res.redirect("/#batteryEncoding");
//     res.end();
// })

// Login Page
    // Accept Username
    // Accept Password
    // Verify credentials
    // Sign in

// Register Page
    // Accept username
    // Accept Password
    // Verify credentials
    // Admin approval
    // Create account

// Charging Boy dashboard
    // Encoding Section
        // Select Encoding Button
            // Battery Encoding
                // Pop up Form Generated
                    // Select Category -- UNIT IN/UNIT OUT/CHARGE IN/CHARGE OUT
                    // Encode Data -- VOLTAGE. UNIT. DRIVER. TIME. DATE.
                    // Store Data

            // Collection Encoding
                // Pop up Form Generated
                    // Encode Data
                    // Store Data

            // Akelco Reading
                // Pop up Form Generated
                    // Encode Data
                    // Store Data
    // Table of Records
        // Organize by latest swaps. Batteries Out. Pending Collectibles.
        // Read data set
        // Display by earliest OUT record.
        // DATE OUT / TIME OUT
        // DATE IN / TIME IN

// Admin dashboard
    // Main
        // Summary of Units Operating
        // Collection Report
            // Boundary
            // Battery Rent
            // Electricity Fee
        // Akelco Reading
            // Electricity Cost Estimate
                // Daily
                // Billing month-to-date

app.listen(port, function(){
    console.log(`The application is running on localhost:${port}!`)
});