node.js - Mac で「npm start」を実行できません

Question

次のコマンド「npm start」を実行しようとしていますが、次のエラーがスローされます。

internal/net.js:17
    throw new RangeError('"port" argument must be >= 0 and < 65536');
    ^

RangeError: "port" argument must be >= 0 and < 65536
    at assertPort (internal/net.js:17:11)
    at Server.listen (net.js:1389:5)
    at EventEmitter.listen (/Users/keyurshah/fulljs/node_modules/express/lib/application.js:617:24)
    at Object.<anonymous> (/Users/keyurshah/fulljs/server.js:10:8)
    at Module._compile (module.js:570:32)
    at loader (/Users/keyurshah/fulljs/node_modules/babel-register/lib/node.js:144:5)
    at Object.require.extensions.(anonymous function) [as .js] (/Users/keyurshah/fulljs/node_modules/babel-register/lib/node.js:154:7)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)
[nodemon] app crashed - waiting for file changes before starting...