我的rails应用启动时出现此错误。这可能是什么原因导致的?
c:\test_install>rails server
C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/win32/registry.rb:70:in `find': unkno
wn encoding name - CP720 (ArgumentError)
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/win32/registry.rb:70:in
`<module:Win32>'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/win32/registry.rb:3:in `
<top (required)>'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/rubygems/core_ext/kernel
_require.rb:55:in `require'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/rubygems/core_ext/kernel
_require.rb:55:in `require'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/win32/resolv.rb:6:in `<t
op (required)>'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/rubygems/core_ext/kernel
_require.rb:55:in `require'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/rubygems/core_ext/kernel
_require.rb:55:in `require'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/resolv.rb:170:in `<class
:Hosts>'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/resolv.rb:167:in `<class
:Resolv>'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/resolv.rb:37:in `<top (r
equired)>'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/rubygems/core_ext/kernel
_require.rb:55:in `require'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/rubygems/core_ext/kernel
_require.rb:55:in `require'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/rubygems/remote_fetcher.
rb:5:in `<top (required)>'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/rubygems/core_ext/kernel
_require.rb:55:in `require'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/rubygems/core_ext/kernel
_require.rb:55:in `require'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.12.0
.pre.1/lib/bundler/gem_remote_fetcher.rb:2:in `<top (required)>'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/rubygems/core_ext/kernel
_require.rb:55:in `require'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/rubygems/core_ext/kernel
_require.rb:55:in `require'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.12.0
.pre.1/lib/bundler.rb:7:in `<top (required)>'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/rubygems/core_ext/kernel
_require.rb:55:in `require'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/rubygems/core_ext/kernel
_require.rb:55:in `require'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.12.0
.pre.1/lib/bundler/setup.rb:5:in `<top (required)>'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/rubygems/core_ext/kernel
_require.rb:135:in `require'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/rubygems/core_ext/kernel
_require.rb:135:in `rescue in require'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/rubygems/core_ext/kernel
_require.rb:144:in `require'
from c:/test_install/config/boot.rb:3:in `<top (required)>'
from bin/rails:3:in `require_relative'
from bin/rails:3:in `<main>'
c:\test_install>gem install rails