Problem running rake test

I’m using the One-click 1.8.7rc2 Ruby Windows installer, everything
has been working fine up till now, when i want to start getting into
testing, i got this error, any reason why?

C:/Ruby/bin/ruby -Ilib;test “C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/
lib/rake/rake_test_loader.rb” “test/unit/word_test.rb”
C:/Ruby/lib/ruby/1.8/erb.rb:469:in scan': You have a nil object when you didn't expect it! (NoMethodError) You might have expected an instance of Array. The error occurred while evaluating nil.empty? from C:/Ruby/lib/ruby/1.8/erb.rb:525:incompile’
from C:/Ruby/lib/ruby/1.8/erb.rb:692:in initialize' from C:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.2.2/lib/ action_view/template_handlers/erb.rb:51:innew’
from C:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.2.2/lib/
action_view/template_handlers/erb.rb:51:in compile' from C:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.2.2/lib/ action_view/template_handler.rb:11:incall’
from C:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.2.2/lib/
action_view/renderable.rb:21:in _unmemoized_compiled_source' from C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.2.2/lib/ active_support/memoizable.rb:57:incompiled_source’
from C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.2.2/lib/
active_support/memoizable.rb:25:in __send__' ... 24 levels... from C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake/ rake_test_loader.rb:5:inload’
from C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake/
rake_test_loader.rb:5
from C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake/
rake_test_loader.rb:5:in each' from C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake/ rake_test_loader.rb:5 C:/Ruby/bin/ruby -Ilib;test "C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/ lib/rake/rake_test_loader.rb" "test/functional/admin/words_controller _test.rb" "test/functional/words_controller_test.rb" C:/Ruby/lib/ruby/1.8/erb.rb:469:inscan’: You have a nil object when
you didn’t expect it! (NoMethodError)
You might have expected an instance of Array.
The error occurred while evaluating nil.empty?
from C:/Ruby/lib/ruby/1.8/erb.rb:525:in compile' from C:/Ruby/lib/ruby/1.8/erb.rb:692:ininitialize’
from C:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.2.2/lib/
action_view/template_handlers/erb.rb:51:in new' from C:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.2.2/lib/ action_view/template_handlers/erb.rb:51:incompile’
from C:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.2.2/lib/
action_view/template_handler.rb:11:in call' from C:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.2.2/lib/ action_view/renderable.rb:21:in_unmemoized_compiled_source’
from C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.2.2/lib/
active_support/memoizable.rb:57:in compiled_source' from C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.2.2/lib/ active_support/memoizable.rb:25:insend
… 24 levels…
from C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake/
rake_test_loader.rb:5:in load' from C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake/ rake_test_loader.rb:5 from C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake/ rake_test_loader.rb:5:ineach’
from C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake/
rake_test_loader.rb:5
C:/Ruby/bin/ruby -Ilib;test “C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/
lib/rake/rake_test_loader.rb”
Errors running test:units and test:functionals!