Ruby on rails rubyonrails中rakedb:create命令出错

当我键入命令rake db:create时，终端上显示了以下错误

rake aborted!
cannot load such file -- active_support/core_ext/class/inheritable_attributes
/home/shashikant/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-3.2.11/lib/active_support/dependencies.rb:251:in `require'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-3.2.11/lib/active_support/dependencies.rb:251:in `block in require'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-3.2.11/lib/active_support/dependencies.rb:236:in `load_dependency'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-3.2.11/lib/active_support/dependencies.rb:251:in `require'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385/gems/supermodel-0.1.4/lib/supermodel.rb:5:in `<top (required)>'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:68:in `require'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:66:in `each'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:66:in `block in require'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:55:in `each'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:55:in `require'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385@global/gems/bundler-1.2.3/lib/bundler.rb:128:in `require'
/home/shashikant/railsproject/online_exams_system/config/application.rb:7:in `<top (required)>'
/home/shashikant/railsproject/online_exams_system/Rakefile:5:in `require'
/home/shashikant/railsproject/online_exams_system/Rakefile:5:in `<top (required)>'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385/bin/ruby_noexec_wrapper:14:in `eval'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385/bin/ruby_noexec_wrapper:14:in `<main>'
(See full trace by running task with --trace)

rake中止！
无法加载此类文件--活动\u支持/core\u ext/class/inheritable\u属性
/home/shashikant/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-3.2.11/lib/active\u support/dependencies.rb:251:in'require'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-3.2.11/lib/active\u-support/dependencies.rb:251:在'block in require'中
/home/shashikant/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-3.2.11/lib/active\u support/dependencies.rb:236:in'load\u dependencity'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-3.2.11/lib/active\u support/dependencies.rb:251:in'require'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385/gems/supermodel-0.1.4/lib/supermodel.rb:5:in`'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:68:in'require'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:68:in'block（2层）in require'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:66:in'each'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:66:in'block in require'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:55:in'each'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:55:in'require'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385@global/gems/bundler-1.2.3/lib/bundler.rb:128:in'require'
/home/shashikant/railsproject/online\u tests\u system/config/application.rb:7:in`'
/home/shashikant/railsproject/online_考试系统/Rakefile:5:in'require'
/home/shashikant/railsproject/online\u Tests\u system/Rakefile:5:in`'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385/bin/ruby\u noexec\u包装：14:in'eval'
/home/shashikant/.rvm/gems/ruby-1.9.3-p385/bin/ruby\u noexec\u包装：14:in`'
（通过使用--trace运行任务查看完整跟踪）

我刚刚从github下载了文件“inheritable_attributes.rb”，在指定目录中添加文件并运行命令rake db:migrate后，将显示其他文件名。请尝试运行

bundle install

first。我也这样做了，仍然会遇到相同的错误