Error: Cannot find module './Mime' - node.js

Question

I am trying to get a heroku project running (following the tutorial here) and I'm running into a bit of trouble.
The node task on Heroku is throwing the following:
app[web.1]: module.js:540
app[web.1]: throw err;
app[web.1]: ^
app[web.1]:
app[web.1]: Error: Cannot find module './Mime'
app[web.1]: at Function.Module._resolveFilename (module.js:538:15)
app[web.1]: at Function.Module._load (module.js:468:25)
app[web.1]: at Module.require (module.js:587:17)
app[web.1]: at Object.<anonymous> (/app/node_modules/mime/index.js:3:12)
app[web.1]: at require (internal/module.js:11:18)
app[web.1]: at Module._compile (module.js:643:30)
app[web.1]: at Object.Module._extensions..js (module.js:654:10)
app[web.1]: at Module.load (module.js:556:32)
app[web.1]: at tryModuleLoad (module.js:499:12)
app[web.1]: at Function.Module._load (module.js:491:3)
I have installed (with -save) all of the dependencies I need including mime, but it seems like it's getting caught up with the mime module itself, here's the mime node_module:
1,545 .eslintrc.json
<DIR> .github
9,230 CHANGELOG.md
157 cli.js
127 index.js
1,098 LICENSE
101 lite.js
1,951 Mime.js
2,824 package.json
5,468 README.md
<DIR> src
<DIR> types
The mime/index.js file:
'use strict';
var Mime = require('./Mime');
module.exports = new Mime(require('./types/standard'), require('./types/other'));
and my project's dependencies
"dependencies": {
"body-parser": "^1.15.2",
"cheerio": "^1.0.0-rc.2",
"cookie-parser": "^1.4.3",
"express": "^4.14.0",
"express-handlebars": "^3.0.0",
"express-less": "^0.1.0",
"express-minify": "^0.2.0",
"favicon": "0.0.2",
"helmet": "^2.3.0",
"http": "0.0.0",
"logger": "0.0.1",
"mime": "^2.0.3",
"mongodb": "^2.2.11",
"morgan": "^1.7.0",
"nodemailer": "^4.4.1",
"nodemailer-sendgrid-transport": "^0.2.0",
"path": "^0.12.7",
"serve-favicon": "^2.3.0"
}
Thanks for your help!

Answer 1

Whelp, hard to say 100% what I did to fix the issue but it was probably one of the following things.
I added "engines": {"node": "7.5.0","npm": "4.1.2"} to my node package (see here)
I added a Procfile to the root with web: node server.js (see here)
as a side note, caching was a big issue for me after I solved this issue. This link may help with that.