ORMError NO_SUPPORT: Connection protocol not supported - have you installed the database driver for postgres?

I'm trying to deploy a nodejs application on ubuntu 13.10. I have tested it on my local mac( working good).

But when I try to run it on my ubuntu server, i got this:

[ORMError NO_SUPPORT: Connection protocol not supported - have you installed the database driver for postgres?]
at Object.exports.connect (/home/ubuntu/node_modules/orm/lib/ORM.js:138:21)
at Object.module.exports (/home/ubuntu/node_modules/orm/lib/Express.js:12:6)
at Object.exports.express (/home/ubuntu/node_modules/orm/lib/ORM.js:39:30)
at Object.<anonymous> (/home/ubuntu/www/sher/nodejs/app.js:30:13)
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)
at require (module.js:380:17)
error: Forever detected script exited with code: 8

FYI:

I installed npm install pg after i got this error, but didn't work.

I also instadded postgresql9.1 with sudo apt-get install build-essential postgresql-9.1 postgresql-server-dev-9.1 libxml2-dev libproj-dev libjson0-dev xsltproc docbook-xsl docbook-mathml.

Anyone can suggest any idea whats going on here?

Thank you!

{
  "name": "nodejs",
  "version": "0.0.1",
  "private": true,
  "scripts": {
  "start": "node ./bin/www"
},
  "dependencies": {
    "express": "~4.2.0",
    "static-favicon": "~1.0.0",
    "morgan": "~1.0.0",
    "cookie-parser": "~1.0.1",
    "body-parser": "~1.0.0",
    "debug": "~0.7.4",
    "jade": "~1.3.0"
  }
}

I just reinstalled all packages and modules again one by one. Seems fixed the problem.