after gem update 2011-02-01 (most likely: rubygems-update-1.4.2 -> 1.5.0)

gistfile1.txt

$ ./script/server 
=> Booting Mongrel
=> Rails 2.3.5 application starting on http://0.0.0.0:3000
/usr/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/rails/gem_dependency.rb:119:in `requirement': undefined local variable or method `version_requirements' for #<Rails::GemDependency:0xf6e64a78> (NameError)
        from /usr/local/lib/site_ruby/1.8/rubygems.rb:254:in `activate'
        from /usr/local/lib/site_ruby/1.8/rubygems.rb:1204:in `gem'
        from /usr/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/rails/gem_dependency.rb:73:in `add_load_paths'
        from /usr/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/initializer.rb:301:in `add_gem_load_paths'
        from /usr/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/initializer.rb:301:in `each'
        from /usr/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/initializer.rb:301:in `add_gem_load_paths'
        from /usr/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/initializer.rb:132:in `process'
        from /usr/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/initializer.rb:113:in `send'
        from /usr/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/initializer.rb:113:in `run'
        from ** config/environment.rb:13
        from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:29:in `gem_original_require'
        from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:29:in `require'
        from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:156:in `require'
        from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:521:in `new_constants_in'
        from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:156:in `require'
        from /usr/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/commands/server.rb:84
        from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:29:in `gem_original_require'
        from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:29:in `require'
        from ./script/server:3

This issue can be resolved by editing Rails 'environment.rb' file.
Please visit the link http://www.redmine.org/issues/7516#note-3

Thank you. Quite helpful.

Hi Guys I have the same problem,

script/server

=> Booting Mongrel
=> Rails 2.3.5 application starting on http://0.0.0.0:3000
/Library/Ruby/Gems/1.8/gems/rails-2.3.5/lib/rails/gem_dependency.rb:119:Warning: Gem::Dependency#version_requirements is deprecated and will be removed on or after August 2010. Use #requirement
/Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:440:in load_missing_constant': uninitialized constant ActiveSupport::Concern (NameError) from /Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:80:inconst_missing'
from /Library/Ruby/Gems/1.8/gems/breadcrumbs_on_rails-2.0.0/lib/breadcrumbs_on_rails/controller_mixin.rb:20
from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in gem_original_require' from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:inrequire'
from /Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:156:in require' from /Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:521:innew_constants_in'
from /Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:156:in require' from /Library/Ruby/Gems/1.8/gems/breadcrumbs_on_rails-2.0.0/lib/breadcrumbs_on_rails.rb:17 from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:ingem_original_require'
from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in require' from /Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:156:inrequire'
from /Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:521:in new_constants_in' from /Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:156:inrequire'
from /Library/Ruby/Gems/1.8/gems/rails-2.3.5/lib/rails/gem_dependency.rb:208:in load' from /Library/Ruby/Gems/1.8/gems/rails-2.3.5/lib/initializer.rb:307:inload_gems'
from /Library/Ruby/Gems/1.8/gems/rails-2.3.5/lib/initializer.rb:307:in each' from /Library/Ruby/Gems/1.8/gems/rails-2.3.5/lib/initializer.rb:307:inload_gems'
from /Library/Ruby/Gems/1.8/gems/rails-2.3.5/lib/initializer.rb:164:in process' from /Library/Ruby/Gems/1.8/gems/rails-2.3.5/lib/initializer.rb:113:insend'
from /Library/Ruby/Gems/1.8/gems/rails-2.3.5/lib/initializer.rb:113:in run' from /Users/franciscadasilvamunhoz/adlux-network/config/environment.rb:19 from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:ingem_original_require'
from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in require' from /Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:156:inrequire'
from /Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:521:in new_constants_in' from /Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:156:inrequire'
from /Library/Ruby/Gems/1.8/gems/rails-2.3.5/lib/commands/server.rb:84
from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in gem_original_require' from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:inrequire'
from script/server:3

Can you please help me to solve this issue?

Thanks a lot. Got this link after 2 long days of battle with this issue and the above commands seem to have done the trick.

PS. THANK YOU. I had this same problem... glad I only had it for about 1 hour :)

Thank you!

This is continuing to help people, cough me. Thanks.

helpful helpful

thanks for this, somehow I was missing the final 'update_rubygems' call, thanks for the post

Four years later, it helped me. Thanks!