我已经安装了 gem capistrano，现在我正在尝试从测试分支进行cap deploy，但是它给出了一些错误并且 cap deploy 失败了。
这是错误堆栈跟踪：
LoadError: no such file to load -- jruby_pageant
require at org/jruby/RubyKernel.java:1027
require at c:/jruby-1.7.2/lib/ruby/shared/rubygems/custom_require.rb:36
(root) at c:/jruby-1.7.2/lib/ruby/gems/shared/gems/net-ssh-2.6.7/lib/net/ssh/
authentication/agent/java_pageant.rb:1
require at org/jruby/RubyKernel.java:1027
require at c:/jruby-1.7.2/lib/ruby/shared/rubygems/custom_require.rb:36
(root) at c:/jruby-1.7.2/lib/ruby/gems/shared/gems/net-ssh-2.6.7/lib/net/ssh/
authentication/agent.rb:1
require at org/jruby/RubyKernel.java:1027
require at c:/jruby-1.7.2/lib/ruby/shared/rubygems/custom_require.rb:36
(root) at c:/jruby-1.7.2/lib/ruby/gems/shared/gems/net-ssh-2.6.7/lib/net/ssh/
authentication/agent.rb:20
require at org/jruby/RubyKernel.java:1027
require at c:/jruby-1.7.2/lib/ruby/shared/rubygems/custom_require.rb:36
(root) at c:/jruby-1.7.2/lib/ruby/gems/shared/gems/net-ssh-2.6.7/lib/net/ssh/
authentication/key_manager.rb:1
require at org/jruby/RubyKernel.java:1027
require at c:/jruby-1.7.2/lib/ruby/shared/rubygems/custom_require.rb:36
(root) at c:/jruby-1.7.2/lib/ruby/gems/shared/gems/net-ssh-2.6.7/lib/net/ssh/
authentication/key_manager.rb:4
require at org/jruby/RubyKernel.java:1027
(root) at c:/jruby-1.7.2/lib/ruby/gems/shared/gems/net-ssh-2.6.7/lib/net/ssh/
authentication/session.rb:1
(root) at c:/jruby-1.7.2/lib/ruby/gems/shared/gems/net-ssh-2.6.7/lib/net/ssh/
authentication/session.rb:4
require at org/jruby/RubyKernel.java:1027
(root) at c:/jruby-1.7.2/lib/ruby/gems/shared/gems/net-ssh-2.6.7/lib/net/ssh.
rb:1
(root) at c:/jruby-1.7.2/lib/ruby/gems/shared/gems/net-ssh-2.6.7/lib/net/ssh.
rb:11
require at org/jruby/RubyKernel.java:1027
(root) at c:/jruby-1.7.2/lib/ruby/shared/rubygems/custom_require.rb:1
require at c:/jruby-1.7.2/lib/ruby/shared/rubygems/custom_require.rb:36
require at org/jruby/RubyKernel.java:1027
(root) at c:/jruby-1.7.2/lib/ruby/gems/shared/gems/net-ssh-gateway-1.2.0/lib/
net/ssh/gateway.rb:2
(root) at c:/jruby-1.7.2/lib/ruby/shared/rubygems/custom_require.rb:1
require at org/jruby/RubyKernel.java:1027
require at c:/jruby-1.7.2/lib/ruby/shared/rubygems/custom_require.rb:36
(root) at c:/jruby-1.7.2/lib/ruby/gems/shared/gems/capistrano-2.15.4/lib/capi
strano/configuration/connections.rb:2
require at org/jruby/RubyKernel.java:1027
(root) at c:/jruby-1.7.2/lib/ruby/shared/rubygems/custom_require.rb:1
require at c:/jruby-1.7.2/lib/ruby/shared/rubygems/custom_require.rb:36
load at org/jruby/RubyKernel.java:1046
(root) at c:\jruby-1.7.2\bin\cap:23
有人可以帮忙吗？提前致谢。