在ruby中制作应用程序时无法加载此类文件错误

Question

在ruby on rails中创建应用程序时出现以下错误：

ajeet@ajeetpc:~$ rails new first_app
/home/ajeet/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- active_support (LoadError)
from /home/ajeet/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /usr/lib/ruby/vendor_ruby/railties/lib/rails_generator.rb:30:in `<top (required)>'
from /home/ajeet/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /home/ajeet/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /usr/lib/ruby/vendor_ruby/railties/bin/rails:16:in `<main>'  

Answer 1

似乎没有正确安装rails gem。尝试解决它

gem uninstall rails
gem install rails

然后再次运行rails new first_app。