我正在使用Redmine版本2.5.2稳定。
服务器崩溃后，我们重新启动了服务器，发现redmine没有启动。
当我使用命令行启动rails时，出现以下错误：
/usr/lib/ruby/site_ruby/1.8/rubygems.rb:233:in `activate': can't activate rack (~> 1.4.5, runtime) for ["actionpack-3.2.18", "railties-3.2.18"], already activated rack-1.6.0.beta for ["rack-ssl-1.3.4", "railties-3.2.18"] (Gem::LoadError) from /usr/lib/ruby/site_ruby/1.8/rubygems.rb:249:in `activate' from /usr/lib/ruby/site_ruby/1.8/rubygems.rb:248:in `each' from /usr/lib/ruby/site_ruby/1.8/rubygems.rb:248:in `activate' from /usr/lib/ruby/site_ruby/1.8/rubygems.rb:249:in `activate' from /usr/lib/ruby/site_ruby/1.8/rubygems.rb:248:in `each' from /usr/lib/ruby/site_ruby/1.8/rubygems.rb:248:in `activate' from /usr/lib/ruby/site_ruby/1.8/rubygems.rb:1082:in `gem' from /usr/local/rvm/gems/ruby-1.9.3-p547/bin/rails:22 from /usr/local/rvm/gems/ruby-1.9.3-p547/bin/ruby_executable_hooks:15
请find我的gem名单
*** LOCAL GEMS *** actionmailer (3.2.18, 3.2.17) actionpack (3.2.18, 3.2.17) activemodel (3.2.18, 3.2.17) activerecord (3.2.18, 3.2.17) activeresource (3.2.18, 3.2.17) activesupport (3.2.18, 3.2.17) acts-as-taggable-on (2.3.3) arel (3.0.3) awesome_nested_set (2.1.6) builder (3.0.4, 3.0.0) bundler (1.9.2, 1.7.3) capybara (2.1.0) childprocess (0.5.3) coderay (1.1.0, 1.0.9) coffee-rails (3.2.2) coffee-script (2.2.0) coffee-script-source (1.7.0) commonjs (0.2.7) daemon_controller (1.2.0) daemons (1.1.9) delayed_job (4.0.6) delayed_job_active_record (4.0.3) diff-lcs (1.2.5) erubis (2.7.0) eventmachine (1.0.3) execjs (2.5.2, 2.0.2) faraday (0.8.8) fastercsv (1.5.5) ffi (1.9.3) git (1.2.9.1) hashie (2.0.5) hike (1.2.3) httpauth (0.2.0) i18n (0.7.0, 0.6.11, 0.6.9) journey (1.0.4) jquery-rails (3.0.4, 2.0.3) jquery-ui-rails (5.0.3, 5.0.2) json (1.8.2, 1.8.1) jwt (0.1.8) less (2.3.3) less-rails (2.3.3) less-rails-bootstrap (2.3.3) libv8 (3.11.8.17 x86_64-linux, 3.11.8.13 x86_64-linux) liquid (2.4.1) mail (2.5.4) metaclass (0.0.4) method_source (0.8.1) mime-types (1.25.1) mini_portile (0.6.0) mocha (1.1.0) money (5.0.0) multi_json (1.11.0, 1.10.1, 1.10.0) multipart-post (1.2.0) mysql2 (0.3.18, 0.3.16) net-ldap (0.3.1) node (0.0.2) nokogiri (1.6.3.1) oauth2 (0.8.1) omniauth (1.1.4) omniauth-oauth2 (1.1.1) omniauth-shopify-oauth2 (1.1.2) passenger (5.0.6, 4.0.50) pg (0.16.0) polyglot (0.3.5, 0.3.4) pry (0.9.12.2) pry-rails (0.3.1) quiet_assets (1.0.2) rack (1.6.0.beta, 1.4.5) rack-cache (1.2) rack-openid (1.4.2) rack-ssl (1.3.4) rack-test (0.6.3, 0.6.2) rails (3.2.18, 3.2.17) railties (3.2.18, 3.2.17) rake (10.4.2, 10.3.2, 10.3.1) rdoc (3.12.2) redcarpet (2.3.0) RedCloth (3.0.4) ref (1.0.5, 1.0.2) render_parent (0.0.5) rmagick (2.14.0, 2.13.3) rspec (3.2.0) rspec-core (3.2.3) rspec-expectations (3.2.1) rspec-mocks (3.2.1) rspec-support (3.2.2) ruby-ole (1.2.11.8) ruby-openid (2.3.0) rubyzip (1.1.6) sass (3.3.7) sass-rails (3.2.6) selenium-webdriver (2.43.0) shopify_api (3.0.3) shopify_app (4.2.3) shoulda (3.3.2) shoulda-context (1.0.2) shoulda-matchers (1.4.1) slim (3.0.3) slop (3.4.5) spreadsheet (0.6.9) sprockets (2.2.3, 2.2.2) sqlite3 (1.3.7) state_machine (1.2.0) temple (0.7.5) therubyracer (0.11.4) thor (0.19.1) tilt (1.4.1) treetop (1.4.15) tzinfo (0.3.43, 0.3.41, 0.3.39) vcard (0.2.12) webrat (0.7.3) websocket (1.2.1) will_paginate (3.0.7) xpath (2.0.0) yard (0.8.7.4)
有些软件包需要rack (~> 1.4.5, runtime)所以删除已经安装的testing版本，然后安装稳定版本1.4.5，然后启动你的rails项目。