rubinius debugger backtrace

gistfile1.txt

admin2:ruby kwleland$ ruby -Xdebug x8.rb
An exception occurred running the debugger:

    no such file to load -- rubinius/compiler/iseq (LoadError)

Backtrace:

                         Rubinius::CodeLoader#load_error at kernel/common/code_loader.rb:440
               Rubinius::CodeLoader#resolve_require_path at kernel/common/code_loader.rb:423
                     { } in Rubinius::CodeLoader#require at kernel/common/code_loader.rb:103
                                    Rubinius.synchronize at kernel/bootstrap/rubinius.rb:137
                            Rubinius::CodeLoader#require at kernel/common/code_loader.rb:102
                            Rubinius::CodeLoader.require at kernel/common/code_loader.rb:237
           Kernel(Object)#gem_original_require (require) at kernel/common/kernel.rb:685
                                 Kernel(Object)#require at /Users/kwleland/.rvm/rubies/rbx-2.2.1/library/rubygems
                                                           /core_ext/kernel_require.rb:55
                                      Object#__script__ at /Users/kwleland/.rvm/gems/rbx-2.2.1/gems
                                                           /rubinius-debugger-2.0.0/lib/rubinius/debugger.rb:6
                            Rubinius::CodeLoader.require at kernel/common/code_loader.rb:243
  Kernel(Rubinius::Loader)#gem_original_require (require) at kernel/common/kernel.rb:685
                       Kernel(Rubinius::Loader)#require at /Users/kwleland/.rvm/rubies/rbx-2.2.1/library/rubygems
                                                           /core_ext/kernel_require.rb:135
                               Rubinius::Loader#debugger at kernel/loader.rb:564
                                   Rubinius::Loader#main at kernel/loader.rb:827