Nick Karnik
Nick Karnik

Computer Scientist | Hacker | Entrepreneur | Ex-Microsoft | YC



undefined method `time_zone=' for # (NoMethodError)

I faced this error on OS X – Leopard when I updated my gems and created a new rails project. The problem is that Leopard ships with gem pointing to, or you could be on a different platform with the same issue.

Nick KarnikNick Karnik

The solution is to uninstall Rails (Currently 2.0.2 is the latest release), so anything > 2.0.2 should be removed.

Remove all versions > 2.0.2 (or latest release) of rails (or all other versions if you don’t use them)

sudo gem uninstall rails

Make sure the source is pointing to “” by running gem source. If it is pointing to “”, remove it by typing the following:

sudo gem remove -r “”

To install the latest release version run:

sudo gem install rails -v 2.0.2

Remember to recreate your rails project for any new projects as they create files that cause problems. For older projects, just making sure the right version is installed should work.