Bug with running NUnit test

[DavidSSL]

I've tried running NUnit tests but I get the following:

** Invoke build:test (first_time)
** Execute build:test
Running NUnit Tests...
rake aborted!
undefined method map' for "Some.dll":String C:/Ruby192/lib/ruby/gems/1.9.1/gems/albacore-0.2.7/lib/albacore/nunittestrunner.rb:30:inget_command_parameters'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/albacore-0.2.7/lib/albacore/nunittestrunner.rb:35:in execute' C:/Ruby192/lib/ruby/gems/1.9.1/gems/albacore-0.2.7/lib/albacore/support/createtask.rb:24:inblock in nunit'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:205:in call' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:205:inblock in execute'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:200:in each' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:200:inexecute'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:158:in block in invoke_with_call_chain' C:/Ruby192/lib/ruby/1.9.1/monitor.rb:201:inmon_synchronize'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:151:in invoke_with_call_chain' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:176:inblock in invoke_prerequisites'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:174:in each' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:174:ininvoke_prerequisites'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:157:in block in invoke_with_call_chain' C:/Ruby192/lib/ruby/1.9.1/monitor.rb:201:inmon_synchronize'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:151:in invoke_with_call_chain' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:176:inblock in invoke_prerequisites'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:174:in each' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:174:ininvoke_prerequisites'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:157:in block in invoke_with_call_chain' C:/Ruby192/lib/ruby/1.9.1/monitor.rb:201:inmon_synchronize'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:151:in invoke_with_call_chain' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:144:ininvoke'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:116:in invoke_task' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:94:inblock (2 levels) in top_level'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:94:in each' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:94:inblock in top_level'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:133:in standard_exception_handling' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:88:intop_level'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:66:in block in run' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:133:instandard_exception_handling'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:63:in run' C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2.2/bin/rake:33:in<top (required)>'
C:/Ruby192/bin/rake:19:in load' C:/Ruby192/bin/rake:19:in

'
Tasks: TOP => default => build:all => build:test