'uninitialized constant ActionPack' when starting rails

Question

When starting my rails server I'm getting an 'uninitialized constant ActionPack' error.

raw stack trace

I'm using blunder with rails 2.3.8

running 'bundle list' shows:

  * actionmailer (2.3.8)
  * actionpack (2.3.8)
  * activerecord (2.3.8)
  * activeresource (2.3.8)
  * activesupport (2.3.8)
  * acts-as-taggable-on (2.0.6)
  * authlogic (2.1.5)
  * builder (2.1.2)
  * cucumber (0.7.3)
  * cucumber-rails (0.3.1)
  * database_cleaner (0.5.2)
  * diff-lcs (1.1.2)
  * faker (0.3.1)
  * gherkin (1.0.30)
  * haml (3.0.7)
  * hoe (2.6.0)
  * json_pure (1.4.3)
  * machinist (1.0.6)
  * nifty-generators (0.4.0)
  * nokogiri (1.4.2)
  * rack (1.1.0)
  * rack-test (0.5.4)
  * rails (2.3.8)
  * rake (0.8.7)
  * rr (0.10.11)
  * rspec (1.3.0)
  * rspec-rails (1.3.2)
  * rubyforge (2.0.4)
  * sqlite3-ruby (1.2.5)
  * term-ansicolor (1.0.5)
  * test-unit (1.2.3)
  * trollop (1.16.2)
  * webrat (0.7.1)

Any idea what's going on here?

Answer 1

it's a bug in Haml 3.0.7. You can see it http://github.com/nex3/haml/issues#issue/186

So you can add in your bundler :

gem 'actionpack', :require => 'action_pack'

Or you can wait the next release of Haml.

Update: The next release is now out, it's the 3.0.8. It's fix this problem.