耙0.9.1错误

我有一些耙子的问题。我的Gemfile看起来是这样的：耙0.9.1错误

gem 'rails', '3.1.0.rc1' 
gem "rake", "!= 0.9.0"

我得到这个错误，而试图迁移：

[耙--prereqs]耙中止！未初始化的常量Rake :: DSL /Users/nachtmeister/.rvm/rubies/ruby-1.9.2-p136/lib/ruby/1.9.1/rake.rb:2482:in const_missing' /Users/nachtmeister/.rvm/gems/ruby-1.9.2-p136/gems/rake-0.9.1/lib/rake/tasklib.rb:8:in' /Users/nachtmeister /。 rvm/gems/ruby-1.9.2-p136/gems/rake-0.9.1/lib/rake/tasklib.rb：6：在<module:Rake>' /Users/nachtmeister/.rvm/gems/ruby-1.9.2-p136/gems/rake-0.9.1/lib/rake/tasklib.rb:3:in' /Users/nachtmeister/.rvm/gems/ruby-1.9.2- p136/gems/rake-0.9.1/lib/rake/rdoctask.rb：20：在require' /Users/nachtmeister/.rvm/gems/ruby-1.9.2-p136/gems/rake-0.9.1/lib/rake/rdoctask.rb:20:in' /Users/nachtmeister/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.1.0。 rc1/lib/rails/tasks/documentation.rake：1：require' /Users/nachtmeister/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.1.0.rc1/lib/rails/tasks/documentation.rake:1:in' /Users/nachtmeister/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.1.0.rc1/lib/rails/ tasks.rb：16：load' /Users/nachtmeister/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.1.0.rc1/lib/rails/tasks.rb:16:in block' /Users/nachtmeister/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.1.0.rc1/lib/rails/tasks.rb:6：在each' /Users/nachtmeister/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.1.0.rc1/lib/rails/tasks.rb:6:in' /Users/nachtmeister/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.1.0.rc1/lib/rails/application.rb:189:in require' /Users/nachtmeister/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.1.0.rc1/lib/rails/application.rb:189:in block in initialize_tasks' /Users /nachtmeister/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.1.0.rc1/lib/rails/railtie.rb:182:in call' /Users/nachtmeister/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.1.0.rc1/lib/rails/railtie.rb:182:in each' /Users/nachtmeister/.rvm/gems /ruby-1.9.2-p136/gems/railties-3.1.0.rc1/lib/rails/railtie.rb:182:in load_tasks' /Users/nachtmeister/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.1.0.rc1/lib/rails/engine.rb:391:in load_tasks' /Users/nachtmeister/.rvm/gems/ruby-1.9.2- p136/gems/railties-3.1.0.rc1/lib/rails/application.rb：102：in load_tasks' /Users/nachtmeister/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.1.0.rc1/lib/rails/railtie/configurable.rb:28:in method_missing' /Users/nachtmeister/Dropbox/Development/Rails/craffft/Rakefile：7：in <top (required)>' /Users/nachtmeister/.rvm/rubies/ruby-1.9.2-p136/lib/ruby/1.9.1/rake.rb:2373:in load' /用户/ nachtmeister/.rvm/rubies/ruby-1.9.2-p136/lib/ruby/1.9.1/rake.rb：2373：在raw_load_rakefile' /Users/nachtmeister/.rvm/rubies/ruby-1.9.2-p136/lib/ruby/1.9.1/rake.rb:2007:in块中load_rakefil e' /Users/nachtmeister/.rvm/rubies/ruby-1.9.2-p136/lib/ruby/1.9.1/rake.rb:2058:in standard_exception_handling' /Users/nachtmeister/.rvm/rubies/ruby-1.9.2-p136/lib/ruby/1.9.1/rake.rb:2006:in load_rakefile' /Users/nachtmeister/.rvm/rubies/红宝石1.9.2-P136/lib中/红宝石/ 1.9.1/rake.rb：1991年：在run' /Users/nachtmeister/.rvm/rubies/ruby-1.9.2-p136/bin/rake:35:in“