我使用 fedora 的这个指南在我的 Fedora 19 上安装了 metasploit 。完成所有步骤后，我运行msfconsole并收到以下错误：
/usr/local/share/ruby/site_ruby/rubygems/specification.rb:1888:in 'method_missing': undefined local variable or method 'ext_dir' for #<Gem::Specification:0xecbd78 json-1.8.0> (NameError)
from /usr/share/gems/gems/bundler-1.3.1/lib/bundler/rubygems_ext.rb:42:in 'load_paths'
from /usr/share/gems/gems/bundler-1.3.1/lib/bundler/runtime.rb:37:in 'block in setup'
from /usr/share/gems/gems/bundler-1.3.1/lib/bundler/runtime.rb:19:in .setup'
from /usr/share/gems/gems/bundler-1.3.1/lib/bundler.rb:120:in 'setup'
from /usr/share/gems/gems/bundler-1.3.1/lib/bundler/setup.rb:7:in ''top (required)>'
from /usr/local/share/ruby/site_ruby/rubygems/core_ext/kernel_require.rb:135:in 'require'
from /usr/local/share/ruby/site_ruby/rubygems/core_ext/kernel_require.rb:135:in 'rescue in require'
from /usr/local/share/ruby/site_ruby/rubygems/core_ext/kernel_require.rb:144:in 'require'
from /opt/metasploit/msf/lib/fastlib.rb:374:in 'require'
from /opt/metasploit/msf/lib/msfenv.rb:7:in '<top (required)>'
from /usr/local/share/ruby/site_ruby/rubygems/core_ext/kernel_require.rb:55:in 'require'
from /usr/local/share/ruby/site_ruby/rubygems/core_ext/kernel_require.rb:55:in 'require'
from /opt/metasploit/msf/lib/fastlib.rb:374:in 'require'
from /usr/local/bin/msfconsole:21:in '<main>'
任何想法如何解决这一问题？它说 method_missing: undefined local variable or method "ext_dir" 所以这看起来像是某种 Ruby 依赖问题。
更新： msfupdate运行成功。