Why does Ruby 1.9.2 blow up with a JSON gem dependency?

Question

I am having issues with the JSON gem and Ruby 1.9.2. I am upgrading to Rails 3.0.3 and whenever I try to boot the environment it blows up. This is from a empty test project

Answer 1

I had some weird issues after upgrading to Snow Leopard because of the 64-bit difference so if you upgraded to Snow Leopard you might be running into the same thing.

I installed the latest XCode, then blew away my 1.9.2 install using rvm uninstall 1.9.2 and rebuilt all the gems using gem update --system; gem pristine --all.