undefined method `setup' for Bundler:Module

[trevorturk]

I get the following error:

undefined method `setup' for Bundler:Module

When using bundler (0.9.1.pre1) with no other versions of bundler installed.

This is in a Rails 2.3.5 application. I have the recommended initializer in config/preinitializer.rb.

[carllerche]

You most likely have older bundler versions. Due to a couple rubygems bugs, you can only have one version of bundler installed on your system.

[trevorturk]

I definitely only have one version installed:

$ gem list bundler
*** LOCAL GEMS ***
bundler (0.9.3)

...and I'm getting this error.

Do I need to manually clean something out as well?

[michaelcm]

Did you ever figure out the issue? I'm receiving the same error with bundler 1.0.21.