Following this guide produces an error

[yoooee]

When I go through the following steps: $ npm install $ bower install $ tsd install -r -o --save $ gulp serve-dev

The final step results in the following error: gulp-patterns] Watching files... About to crank up node PORT=7203 NODE_ENV=dev ** DEV ** events.js:85 throw er; // Unhandled 'error' event ^ Error: listen EADDRINUSE at exports._errnoException (util.js:746:11) at Server._listen2 (net.js:1129:14) at listen (net.js:1155:10) at Server.listen (net.js:1240:5) at EventEmitter.listen (/##########/gulpTest/node_modules/express/lib/application.js:617:24) at Object. (/##########/gulpTest/src/server/app.js:63:5) at Module._compile (module.js:460:26) at Object.Module._extensions..js (module.js:478:10) at Module.load (module.js:355:32) at Function.Module._load (module.js:310:12) [10:15:38] *** nodemon crashed: script crashed for some reason [10:15:38] [nodemon] app crashed - waiting for file changes before starting...

NOTE: I replaced the path that was displayed in the output with ##########.

[godhand1607]

Looks like your machine's port 7203 is already used. Try changing it