JRuby on Rails IDE Debug Failure

Fast Debugger (ruby-debug-ide 0.4.16, ruby-debug-base 0.10.3.2) listens on 127.0.0.1:54875
=> Booting WEBrick
=> Rails 3.1.3 application starting in dev_jruby on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
=> Debugger enabled
[2012-01-05 23:03:44] INFO  WEBrick 1.3.1
[2012-01-05 23:03:44] INFO  ruby 1.9.2 (2011-10-25) [java]
[2012-01-05 23:03:44] INFO  WEBrick::HTTPServer#start: pid=17440 port=3000
Exception in DebugThread loop: undefined method `is_binary_data?' for "OverviewController":String
Backtrace:
/home/jamie/.rvm/gems/jruby-1.6.5@rails-3/gems/ruby-debug-ide-0.4.16/lib/ruby-debug/xml_printer.rb:124:in `print_variable'
  from: /home/jamie/.rvm/gems/jruby-1.6.5@rails-3/gems/ruby-debug-ide-0.4.16/lib/ruby-debug/xml_printer.rb:71:in `print_variables'
  from: /home/jamie/.rvm/gems/jruby-1.6.5@rails-3/gems/ruby-debug-ide-0.4.16/lib/ruby-debug/xml_printer.rb:253:in `print_element'
  from: /home/jamie/.rvm/gems/jruby-1.6.5@rails-3/gems/ruby-debug-ide-0.4.16/lib/ruby-debug/xml_printer.rb:69:in `print_variables'
  from: org/jruby/RubyBasicObject.java:1700:in `__send__'
  from: org/jruby/RubyKernel.java:2122:in `send'
  from: /home/jamie/.rvm/gems/jruby-1.6.5@rails-3/gems/ruby-debug-ide-0.4.16/lib/ruby-debug/command.rb:85:in `method_missing'
  from: /home/jamie/.rvm/gems/jruby-1.6.5@rails-3/gems/ruby-debug-ide-0.4.16/lib/ruby-debug/commands/variables.rb:130:in `execute'
  from: /home/jamie/.rvm/gems/jruby-1.6.5@rails-3/gems/ruby-debug-ide-0.4.16/lib/ruby-debug/processor.rb:78:in `process_context_commands'
  from: org/jruby/RubyArray.java:1612:in `each'
  from: /home/jamie/.rvm/gems/jruby-1.6.5@rails-3/gems/ruby-debug-ide-0.4.16/lib/ruby-debug/processor.rb:71:in `process_context_commands'
  from: org/jruby/RubyKernel.java:1206:in `catch'
  from: /home/jamie/.rvm/gems/jruby-1.6.5@rails-3/gems/ruby-debug-ide-0.4.16/lib/ruby-debug/processor.rb:70:in `process_context_commands'
  from: /home/jamie/.rvm/gems/jruby-1.6.5@rails-3/gems/ruby-debug-ide-0.4.16/lib/ruby-debug/processor.rb:39:in `process_commands'
  from: org/jruby/RubyKernel.java:1206:in `catch'
  from: /home/jamie/.rvm/gems/jruby-1.6.5@rails-3/gems/ruby-debug-ide-0.4.16/lib/ruby-debug/processor.rb:35:in `process_commands'
  from: /home/jamie/.rvm/gems/jruby-1.6.5@rails-3/gems/ruby-debug-ide-0.4.16/lib/ruby-debug-ide.rb:140:in `start_control'
  from: org/jruby/RubyProc.java:270:in `call'
  from: org/jruby/RubyProc.java:224:in `call'