Missing template index.erb when do rake doc:guides

rake (0.8.7)
rails (2.3.8)

rake doc:guides --trace

** Invoke doc:guides (first_time)
** Execute doc:guides
Generating action_controller_overview
Generating contributing_to_rails
Generating plugins
Generating layouts_and_rendering
Generating testing
Generating security
Generating routing
Generating migrations
Generating debugging_rails_applications
Generating nested_model_forms
Generating performance_testing
Generating configuring
Generating action_mailer_basics
Generating index
rake aborted!
Missing template index.erb in view path /usr/lib/ruby/gems/1.8/gems/
rails-2.3.8/lib/../guides/rails_guides/../source
/usr/lib/ruby/gems/1.8/gems/actionpack-2.3.8/lib/action_view/paths.rb:
74:in `find_template'
/usr/lib/ruby/gems/1.8/gems/actionpack-2.3.8/lib/action_view/base.rb:
264:in `render'
/usr/lib/ruby/gems/1.8/gems/actionpack-2.3.8/lib/action_view/base.rb:
348:in `_render_with_layout'
/usr/lib/ruby/gems/1.8/gems/actionpack-2.3.8/lib/action_view/base.rb:
262:in `render'
/usr/lib/ruby/gems/1.8/gems/rails-2.3.8/lib/../guides/rails_guides/
generator.rb:51:in `generate_guide'
/usr/lib/ruby/gems/1.8/gems/rails-2.3.8/lib/../guides/rails_guides/
generator.rb:45:in `open'
/usr/lib/ruby/gems/1.8/gems/rails-2.3.8/lib/../guides/rails_guides/
generator.rb:45:in `generate_guide'
/usr/lib/ruby/gems/1.8/gems/rails-2.3.8/lib/../guides/rails_guides/
generator.rb:30:in `generate'
/usr/lib/ruby/gems/1.8/gems/rails-2.3.8/lib/../guides/rails_guides/
generator.rb:29:in `each'
/usr/lib/ruby/gems/1.8/gems/rails-2.3.8/lib/../guides/rails_guides/
generator.rb:29:in `generate'
/usr/lib/ruby/gems/1.8/gems/rails-2.3.8/lib/tasks/documentation.rake:
58
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `call'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `execute'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `each'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `execute'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:597:in
`invoke_with_call_chain'
/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in
`invoke_with_call_chain'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:583:in `invoke'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2051:in
`invoke_task'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `each'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in
`standard_exception_handling'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2001:in `run'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in
`standard_exception_handling'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:1998:in `run'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/bin/rake:31
/usr/bin/rake:19:in `load'
/usr/bin/rake:19

Any ideas?
Mann.