When I add ```'/static'``` as the first parameter for app.use(), the app crashes.

/Users/henrymorrow/Documents/treehouse-express-basics/node_modules/express/node_modules/serve-static/index.js:48
  var opts = Object.create(options || null)
                    ^

TypeError: Object prototype may only be an Object or null: /Users/henrymorrow/Documents/treehouse-express-basics/src/public

'use strict';

//requiring for express and posts object
var express = require('express');
var posts = require('./mock/posts.json');

var app = express();

//activate static server
app.use(express.static('/static', __dirname + '/public')); //express is referenced directly and .use sets up the static server. '/static' is the first argument so the prefix can be use to find public files with the url 

//Sets app to understand and find jade files
app.set('view engine', 'jade');
app.set('views', __dirname + '/templates')

//renders the index.jade file
app.get('/', function (req, res) { //req and res are request and response
    res.render('index')
});

//reders the post json object and takes the title key in the object to fit the end of the url as a parameter
app.get('/blog/:title?', function (req, res) {
    var title = req.params.title;
    if (title === undefined) {
        res.status(503);
        res.send("This page is under construction")
    } else {
        var post = posts[title] || {};
        res.render('post', {post: post});
    }
})

//Listens to port 3000 and displays message in the console to let you know app is running
app.listen(3000, function () {
    console.log("The frontend server is running fast on port 3000!");
});