After I updated to Rails 3.0, I encountered the following error on
booting mongrel process.
Can anyone advise? Thank you.

** Starting Mongrel listening at 0.0.0.0:3000
** Starting Rails with development environment...
/Library/Ruby/Gems/1.8/gems/activesupport-3.0.4/lib/active_support/
dependencies.rb:239:in `require': no such file to load -- dispatcher
(LoadError)
        from /Library/Ruby/Gems/1.8/gems/activesupport-3.0.4/lib/
active_support/dependencies.rb:239:in `require'
        from /Library/Ruby/Gems/1.8/gems/activesupport-3.0.4/lib/
active_support/dependencies.rb:225:in `load_dependency'
        from /Library/Ruby/Gems/1.8/gems/activesupport-3.0.4/lib/
active_support/dependencies.rb:596:in `new_constants_in'
        from /Library/Ruby/Gems/1.8/gems/activesupport-3.0.4/lib/
active_support/dependencies.rb:225:in `load_dependency'
        from /Library/Ruby/Gems/1.8/gems/activesupport-3.0.4/lib/
active_support/dependencies.rb:239:in `require'
        from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/
ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/rails.rb:148:in
`rails'
        from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/
ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:113:in `cloaker_'
        from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/
ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/configurator.rb:
149:in `call'
        from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/
ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/configurator.rb:
149:in `listener'
        from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/
ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:99:in `cloaker_'
        from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/
ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/configurator.rb:
50:in `call'
        from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/
ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/configurator.rb:
50:in `initialize'
        from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/
ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:84:in `new'
        from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/
ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:84:in `run'
        from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/
ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/command.rb:212:in
`run'
        from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/
ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:281
        from /usr/bin/mongrel_rails:19:in `load'
        from /usr/bin/mongrel_rails:19

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