NameError: uninitialized constant Gem::SourceIndex

Question

This error appears for a new rails app, with nothing modified, when visiting the homepage (after successfully running bundle install).

Here are the vers

Answer 1

You need to update Bundler: gem update bundler

RubyGems release 2.0 seems to be the trigger for the error:

RubyGems 2.0 includes several new features and many breaking changes. Some of these changes will cause existing software to break. . . . If you are using bundler be sure to install a 1.3.0.prerelease version or newer. Older versions of bundler will not work with RubyGems 2.0.

Here are the issue details.