有人能说出我不能执行刀的原因吗？
尝试执行刀时出现错误：
# knife
/usr/local/rvm/rubies/ruby-1.9.3-p327/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- chef/knife/core/subcommand_loader (LoadError)
from /usr/local/rvm/rubies/ruby-1.9.3-p327/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from /usr/local/rvm/gems/ruby-1.9.3-p327/gems/chef-11.8.0/lib/chef/knife.rb:26:in `<top (required)>'
from /usr/local/rvm/rubies/ruby-1.9.3-p327/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:55:in `require'
from /usr/local/rvm/rubies/ruby-1.9.3-p327/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:55:in `require'
from /usr/local/rvm/gems/ruby-1.9.3-p327/gems/chef-11.8.0/lib/chef/application/knife.rb:18:in `<top (required)>'
from /usr/local/rvm/rubies/ruby-1.9.3-p327/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:55:in `require'
from /usr/local/rvm/rubies/ruby-1.9.3-p327/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:55:in `require'
from /usr/local/rvm/gems/ruby-1.9.3-p327/gems/chef-11.8.0/bin/knife:23:in `<top (required)>'
from /usr/local/rvm/gems/ruby-1.9.3-p327/bin/knife:19:in `load'
from /usr/local/rvm/gems/ruby-1.9.3-p327/bin/knife:19:in `<main>'
from /usr/local/rvm/gems/ruby-1.9.3-p327/bin/ruby_executable_hooks:15:in `eval'
from /usr/local/rvm/gems/ruby-1.9.3-p327/bin/ruby_executable_hooks:15:in `<main>'
其他一些有用的输出：
# rvm list
rvm rubies
=* ruby-1.9.3-p327 [ x86_64 ]
ruby-1.9.3-p551 [ x86_64 ]
# => - current
# =* - current && default
# * - default
另一个：
# rvm env
export PATH="/usr/local/rvm/gems/ruby-1.9.3- p327/bin:/usr/local/rvm/gems/ruby-1.9.3- p327@global/bin:/usr/local/rvm/rubies/ruby-1.9.3-p327/bin:$PATH"
export GEM_HOME='/usr/local/rvm/gems/ruby-1.9.3-p327'
export GEM_PATH='/usr/local/rvm/gems/ruby-1.9.3- p327:/usr/local/rvm/gems/ruby-1.9.3-p327@global'
export MY_RUBY_HOME='/usr/local/rvm/rubies/ruby-1.9.3-p327'
export IRBRC='/usr/local/rvm/rubies/ruby-1.9.3-p327/.irbrc'
unset MAGLEV_HOME
unset RBXOPT
export RUBY_VERSION='ruby-1.9.3-p327'