Cannot find module "gulp-nodemon". On windows 7, 32 bit. Using the Power Shell

I am new to Node.js. I am trying to learn this by doing something. I am making a sentiment analyzer application for Twitter. I am using Gulp. However, when I use "gulp" in my cmd. Please note that I have installed Nodemon. I am getting the following error:

Error: Cannot find module 'gulp-nodemon'
    at Function.Module._resolveFilename (module.js:338:15)
    at Function.Module._load (module.js:280:25)
    at Module.require (module.js:364:17)
    at require (module.js:380:17)
    at Object.<anonymous>   (C:\Users\home\desktop\sentimentAnalysisApp\Gulpfile.js:4:13)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.require (module.js:364:17)

      

        
        
        
      

    

Also, I am following this [tutorial]. http://www.sitepoint.com/creating-sentiment-analysis-application-using-node-js/

Thank.