Redmine

rake aborted!
no such file to load -- rexml/encodings/UTF-8.rb
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/usr/local/lib/ruby/1.8/rexml/document.rb:25
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/var/www/rails_apps/redmine-0.8.4/vendor/rails/activesupport/lib/active_support/vendor/xml-simple-1.0.11/xmlsimple.rb:7
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/var/www/rails_apps/redmine-0.8.4/vendor/rails/activesupport/lib/active_support/core_ext/hash/conversions.rb:4
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/var/www/rails_apps/redmine-0.8.4/vendor/rails/activesupport/lib/active_support/core_ext/hash.rb:2
/var/www/rails_apps/redmine-0.8.4/vendor/rails/activesupport/lib/active_support/core_ext/hash.rb:1:in `each'
/var/www/rails_apps/redmine-0.8.4/vendor/rails/activesupport/lib/active_support/core_ext/hash.rb:1
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/var/www/rails_apps/redmine-0.8.4/vendor/rails/activesupport/lib/active_support/core_ext.rb:3
/var/www/rails_apps/redmine-0.8.4/vendor/rails/activesupport/lib/active_support/core_ext.rb:1:in `each'
/var/www/rails_apps/redmine-0.8.4/vendor/rails/activesupport/lib/active_support/core_ext.rb:1
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
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/var/www/rails_apps/redmine-0.8.4/vendor/rails/activesupport/lib/active_support.rb:31
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/var/www/rails_apps/redmine-0.8.4/vendor/rails/railties/lib/tasks/misc.rake:12
/var/www/rails_apps/redmine-0.8.4/vendor/rails/railties/lib/tasks/rails.rb:4:in `load'
/var/www/rails_apps/redmine-0.8.4/vendor/rails/railties/lib/tasks/rails.rb:4
/var/www/rails_apps/redmine-0.8.4/vendor/rails/railties/lib/tasks/rails.rb:4:in `each'
/var/www/rails_apps/redmine-0.8.4/vendor/rails/railties/lib/tasks/rails.rb:4
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
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/var/www/rails_apps/redmine-0.8.4/Rakefile:10
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2383:in `load'
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/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/bin/rake:31
/usr/local/bin/rake:19:in `load'
/usr/local/bin/rake:19