Cannot read property 'prototype' of undefined

help
1

Hi
I am new in meteor
I deployed my app on heroku using "heroku buildpacks:set https://github.com/AdmitHub/meteor-buildpack-horse.git"
but is showing “Procfile declares types -> (none)” .
So I added custom Procfile in root directory of app
Now app is not running on localhost:3000 and I get output

Uncaught TypeError: Cannot read property 'prototype' of undefined
at meteorInstall.node_modules.express.lib.request.js (modules.js?hash=520639d…:3239)
at fileEvaluate (modules-runtime.js?hash=637cb12…:191)
at require (modules-runtime.js?hash=637cb12…:116)
at meteorInstall.node_modules.express.lib.express.js (modules.js?hash=520639d…:752)
at fileEvaluate (modules-runtime.js?hash=637cb12…:191)
at require (modules-runtime.js?hash=637cb12…:116)
at meteorInstall.node_modules.express.index.js (modules.js?hash=520639d…:721)
at fileEvaluate (modules-runtime.js?hash=637cb12…:191)
at require (modules-runtime.js?hash=637cb12…:116)
at meteorInstall.proxy.js (proxy.js:6)

Procfile contain data

      web: node proxy.js

and proxy.js contain

   /*global process */

  /**
  * Module dependencies.
   */
 var express = require('express'),
http = require('http'),
path = require('path'),
request = require('request');

var app = express();

     app.use(function () {
     console.log("process.env.Port",  process.env.PORT)
     app.set('port', process.env.PORT || 3000);
     });

    app.use('development', function () {
    app.use(express.errorHandler());
   });

   var proxyCounter = 0;

    app.all('/proxy/?*', function(req, res) {
  res.header('Access-Control-Allow-Origin', '*');
  res.header('Access-Control-Allow-Methods', 'GET,POST,PATCH,PUT,DELETE');
  res.header('Access-Control-Allow-Headers', 'Authorization,Content-Type,Salesforceproxy-Endpoint,X-                       Authorization,X-SFDC-Session,SOAPAction');
  if (req.method === 'OPTIONS') {
   return res.end();
 }
    var contentType = "application/x-www-form-urlencoded";
    var sfEndpoint = req.headers["salesforceproxy-endpoint"];
    if (!/^https:\/\/[a-zA-Z0-9\.\-]+\.(force|salesforce|database)\.com\//.test(sfEndpoint)) {
     return res.send(400, "Proxying endpoint is not allowed.");
  }
  var params = {
     url: sfEndpoint || "https://login.salesforce.com//services/oauth2/token",
     method: req.method,
     headers: {
    "Content-Type": req.headers["content-type"],
    "Authorization": req.headers["x-authorization"] || req.headers.authorization,
    "X-SFDC-Session": req.headers["x-sfdc-session"]
   }
}; 
  proxyCounter++;
  console.log("(++req++) " + new Array(proxyCounter+1).join('*'));
  console.log("method=" + params.method + ", url=" + params.url);
  req.pipe(request(params))
  .on('response', function() {
   proxyCounter--;
  console.log("(--res--) " + new Array(proxyCounter+1).join('*'));
 })
.on('error', function() {
  proxyCounter--;
  console.log("(--err--) " + new Array(proxyCounter+1).join('*'));
})
.pipe(res);
});

 app.get('/', function(req, res) {
   res.render('client/main.html');
 });

 http.createServer(app).listen(app.get('port'), function () {
        console.log("Express server listening on port " + app.get('port'));
  });