"Error: Cannot find module 'pkginfo'" - node js app deploying to heroku

I'm getting the following error when attempting to deploy my node.js app to Heroku for the first time:

Application loaded using the "production" environment configuration 2014-08-28T01:02:56.823904+00:00 app[web.1]: at Function.Module._resolveFilename (module.js:338:15) 2014-08-28T01:02:56.823906+00:00 app[web.1]: at Function.Module._load (module.js:280:25) 2014-08-28T01:02:56.823900+00:00 app[web.1]: Error: Cannot find module 'pkginfo' 2014-08-28T01:02:56.817349+00:00 app[web.1]: ^ 2014-08-28T01:02:56.823915+00:00 app[web.1]: at Object.Module._extensions..js (module.js:474:10) 2014-08-28T01:02:56.823908+00:00 app[web.1]: at Module.require (module.js:364:17) 2014-08-28T01:02:56.823910+00:00 app[web.1]: at require (module.js:380:17) 2014-08-28T01:02:56.823912+00:00 app[web.1]: at Object. (/app/node_modules/passport-google-oauth/node_modules/passport-oauth/node_modules/passport/lib/passport/index.js:440:1) 2014-08-28T01:02:56.823913+00:00 app[web.1]: at Module._compile (module.js:456:26) 2014-08-28T01:02:56.823918+00:00 app[web.1]: at Function.Module._load (module.js:312:12) 2014-08-28T01:02:56.814921+00:00 app[web.1]: 2014-08-28T01:02:56.838954+00:00 app[web.1]: error: Forever detected script exited with code: 8 2014-08-28T01:02:56.815953+00:00 app[web.1]: throw err; 2014-08-28T01:02:56.823920+00:00 app[web.1]: at Module.require (module.js:364:17) 2014-08-28T01:02:56.823917+00:00 app[web.1]: at Module.load (module.js:356:32) 2014-08-28T01:02:56.815545+00:00 app[web.1]: module.js:340

I've followed all of the steps from Heroku's website for deploying node, but have been stuck on fixing this above error. I can successfully do "foreman start" on my local computer. At first, after doing "foreman start", I got the same error "Cannot find module 'pkginfo', so i installed pkginfo on my local computer and then foreman start worked and i could launch my app on localhost:5000 without any problems. However, still stuck on fixing this error on Heroku's server. Any help?

Thanks! Jason