Redmine

I'm trying to upgrade 1.4.0 to 2.0.2
I've updated ruby to 1.9.3, rails to 3.2.5 (using bundle update)
Now trying to call "rake --trace generate_secret_token" when get:
rake aborted!
cannot load such file -- source_annotation_extractor
/var/www/redmine/lib/tasks/plugins.rake:1:in `require'
/var/www/redmine/lib/tasks/plugins.rake:1:in `<top (required)>'
/usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.5/lib/rails/engine.rb:425:in `load'
/usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.5/lib/rails/engine.rb:425:in `block in load_tasks'
/usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.5/lib/rails/engine.rb:425:in `each'
/usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.5/lib/rails/engine.rb:425:in `load_tasks'
/usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.5/lib/rails/application.rb:145:in `load_tasks'
/usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.5/lib/rails/railtie/configurable.rb:30:in `method_missing'
/var/www/redmine/Rakefile:7:in `<top (required)>'
/usr/local/lib/ruby/1.9.1/rake/rake_module.rb:25:in `load'
/usr/local/lib/ruby/1.9.1/rake/rake_module.rb:25:in `load_rakefile'
/usr/local/lib/ruby/1.9.1/rake/application.rb:501:in `raw_load_rakefile'
/usr/local/lib/ruby/1.9.1/rake/application.rb:82:in `block in load_rakefile'
/usr/local/lib/ruby/1.9.1/rake/application.rb:133:in `standard_exception_handling'
/usr/local/lib/ruby/1.9.1/rake/application.rb:81:in `load_rakefile'
/usr/local/lib/ruby/1.9.1/rake/application.rb:65:in `block in run'
/usr/local/lib/ruby/1.9.1/rake/application.rb:133:in `standard_exception_handling'
/usr/local/lib/ruby/1.9.1/rake/application.rb:63:in `run'
/usr/local/bin/rake:32:in `<main>'

It seems to me that rake can't find source_annotation_extractor.rb stored in /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.5/lib/rails. How can I solve it? Maybe add something in the Rakefile or in Path? Thanks in advance!