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Problem
You want to deploy to a shared host (dreamhost) that has a later version of rails from the one you have developed your application.
You also have a later version installed in your development pc,and using rake rails:freeze:gems uses the latest one and not the one you want.

Solution
Use the following to freeze the specific version you want, and by using your gems you have installed:
rake rails:freeze:gems VERSION=2.3.2

Problem
Your host (ie dreamhost) for deploying applications doesn’t have the gems you are using in your development.

Solution
After freezing your rails gems with rake rails:freeze:gems, freeze the rest of your gems, not with rake gems:freeze gem=GEM_NAME, as used in previous versions of rails, but with:

rake gems:unpack