title: Getting error while using Express with Node.js
body: <p>I wrote a small program using npm express. while I am running the program i am getting error like below.(I am new to node.js)</p>
  
  <pre><code>module.js:340
      throw err;
            ^
  Error: Cannot find module 'express'
      at Function.Module._resolveFilename (module.js:338:15)
      at Function.Module._load (module.js:280:25)
      at Module.require (module.js:362:17)
      at require (module.js:378:17)
      at Object.&lt;anonymous&gt; (C:\Users\node\node_modules\app.js:1:77)
      at Module._compile (module.js:449:26)
      at Object.Module._extensions..js (module.js:467:10)
      at Module.load (module.js:356:32)
      at Function.Module._load (module.js:312:12)
      at Module.runMain (module.js:492:10)
  </code></pre>