Installing CI on DreamHost - path problem?

[eluser]taewoo[/eluser]
Hi everyone.
I know this is similar to this post but please bear with me.. problem is not exactly same.

I wrote a CI app on my laptop and have uploaded it exactly to my dreamhost server (minus DB settings). Made sure PHP 5 is running... and that all the file chmod settings are correct. Then I changed my settings as
recommended here.

When I point my browser to the URL, however, I get this:

Code:

An Error Was Encountered

Unable to load the requested class: db_session

Of course, first thing i tried was adding "db_session" to $autoload['libraries'] array in the /system/application/config/config.php file. But of course, no luck.

Any tips and pointers?