您需要更新Bundler： gem update bundler

RubyGems版本2.0 似乎是触发器的错误：

RubyGems 2.0包含几项新功能和许多重大更改。其中一些更改会导致现有软件中断。 。 。 。如果您使用捆绑软件，请确保安装1.3.0.prerelease或更新的版本。旧版本的bundler不适用于RubyGems 2.0。

以下是问题详情。

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

Here are the version numbers:

ruby: 1.9.3p392 (2013-02-22 revision 39386) [x86_64-darwin12.2.1]

rails: 3.2.12

rvm: 1.18.14

gem: 2.0.0

bundler: 1.3.0.pre.8

Calling which ruby returns /Users/J/.rvm/rubies/ruby-1.9.3-p392/bin/ruby, which seems fishy, right?

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.