uninitialized constant OAuth2::Error

[grigio]

it seems that sometimes this error pop up from twitter because oauth2 is not ready/loaded.

I tried to move
require 'oauth2'
to the Gemfile and it seems better

[ghost]

The same happened to me when I press the »Exit Twitter and go back to your Application« button on twitter.

[joshhepworth]

The require 'oauth2' line should no longer be required, see the wiki External page for updated code examples.