# Ruby-debug failure in rails2.1

**URL:** <https://www.ruby-forum.com/t/ruby-debug-failure-in-rails2-1/145016>\
**Category:** Rails\
**Created:** [August 5, 2008, 7:59am UTC](https://www.ruby-forum.com/t/ruby-debug-failure-in-rails2-1/145016 "2008-08-05T07:59:34Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![rociiu](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/2bfe46/32.png) [@rociiu](https://www.ruby-forum.com/u/rociiu)\
**Post date:** [August 5, 2008, 7:59am UTC](https://www.ruby-forum.com/t/ruby-debug-failure-in-rails2-1/145016/1 "2008-08-05T07:59:34Z")

</div>

when i use debugger in the spec , after type irb , it raise error below

INTERNAL ERROR!!! wrong number of arguments (2 for 1)  
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb/extend-command.rb:157:in  
`respond_to?' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb/extend-command.rb:157:in`install\_alias\_method’  
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb/extend-command.rb:179:in  
`extend_object' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb/extend-command.rb:178:in`each’  
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb/extend-command.rb:178:in  
`extend_object' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb.rb:93:in`extend’  
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb.rb:93:in  
`initialize' /Library/Ruby/Gems/1.8/gems/ruby-debug-0.10.1/cli/ruby-debug/commands/irb.rb:24:in`new’  
/Library/Ruby/Gems/1.8/gems/ruby-debug-0.10.1/cli/ruby-debug/commands/irb.rb:24:in  
`start_session' /Library/Ruby/Gems/1.8/gems/ruby-debug-0.10.1/cli/ruby-debug/commands/irb.rb:62:in`execute’  
/Library/Ruby/Gems/1.8/gems/ruby-debug-0.10.1/cli/ruby-debug/processor.rb:272:in  
`one_cmd' /Library/Ruby/Gems/1.8/gems/ruby-debug-0.10.1/cli/ruby-debug/processor.rb:259:in`process\_commands’  
/Library/Ruby/Gems/1.8/gems/ruby-debug-0.10.1/cli/ruby-debug/processor.rb:258:in  
`each' /Library/Ruby/Gems/1.8/gems/ruby-debug-0.10.1/cli/ruby-debug/processor.rb:258:in`process\_commands’  
/Library/Ruby/Gems/1.8/gems/ruby-debug-0.10.1/cli/ruby-debug/processor.rb:251:in  
`catch' /Library/Ruby/Gems/1.8/gems/ruby-debug-0.10.1/cli/ruby-debug/processor.rb:251:in`process\_commands’  
/Library/Ruby/Gems/1.8/gems/ruby-debug-0.10.1/cli/ruby-debug/processor.rb:171:in  
`__at_line' (eval):5:in`at\_line’  
(eval):3:in `synchronize' (eval):3:in`at\_line’  
/Library/Ruby/Gems/1.8/gems/ruby-debug-base-0.10.1/lib/ruby-debug-base.rb:52:in  
`at_line' ./spec/models/diagnosis_spec.rb:16 /Users/sunsware/sandbox/dxj/vendor/plugins/rspec/lib/spec/example/example_methods.rb:84:in`instance\_eval’  
/Users/sunsware/sandbox/dxj/vendor/plugins/rspec/lib/spec/example/example\_methods.rb:84:in  
`run_with_description_capturing' /Users/sunsware/sandbox/dxj/vendor/plugins/rspec/lib/spec/example/example_methods.rb:21:in`execute’  
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/timeout.rb:48:in  
`timeout' /Users/sunsware/sandbox/dxj/vendor/plugins/rspec/lib/spec/example/example_methods.rb:18:in`execute’  
/Users/sunsware/sandbox/dxj/vendor/plugins/rspec/lib/spec/example/example\_group\_methods.rb:303:in  
`execute_examples' /Users/sunsware/sandbox/dxj/vendor/plugins/rspec/lib/spec/example/example_group_methods.rb:302:in`each’  
/Users/sunsware/sandbox/dxj/vendor/plugins/rspec/lib/spec/example/example\_group\_methods.rb:302:in  
`execute_examples' /Users/sunsware/sandbox/dxj/vendor/plugins/rspec/lib/spec/example/example_group_methods.rb:130:in`run’  
/Users/sunsware/sandbox/dxj/vendor/plugins/rspec/lib/spec/runner/example\_group\_runner.rb:22:in  
`run' /Users/sunsware/sandbox/dxj/vendor/plugins/rspec/lib/spec/runner/example_group_runner.rb:21:in`each’  
/Users/sunsware/sandbox/dxj/vendor/plugins/rspec/lib/spec/runner/example\_group\_runner.rb:21:in  
`run' /Users/sunsware/sandbox/dxj/vendor/plugins/rspec/lib/spec/runner/options.rb:106:in`run\_examples’  
/Users/sunsware/sandbox/dxj/vendor/plugins/rspec/lib/spec/runner/command\_line.rb:19:in  
`run’  
./script/spec:4…