When running "test" task, error about missing Test::Unit::UI::TestRunnerMediator::TC_TESTCOUNT occurs

Hello,

when running the "test" task on my JRuby projects, I get the following exception:


D:/Programme/jruby-1.3.1/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:105:in `const_missing': uninitialized constant Test::Unit::UI::TestRunnerMediator::TC_TESTCOUNT (NameError)

    from D:/Programme/RubyMine 2.0.1 RC2/rb/testing/patch/testunit/test/unit/ui/teamcity/testrunner.rb:261:in `attach_to_mediator'

    from D:/Programme/RubyMine 2.0.1 RC2/rb/testing/patch/testunit/test/unit/ui/teamcity/testrunner.rb:181:in `start'

    from D:/Programme/jruby-1.3.1/bin/../lib/ruby/1.8/test/unit/ui/testrunnerutilities.rb:29:in `run'

    from D:/Programme/jruby-1.3.1/lib/ruby/1.8/test/unit/autorunner.rb:216:in `run'

    from D:/Programme/jruby-1.3.1/lib/ruby/1.8/test/unit/autorunner.rb:12:in `run'

    from D:/Programme/jruby-1.3.1/bin/../lib/ruby/1.8/test/unit.rb:278

D:/Programme/jruby-1.3.1/bin/jruby.bat -I"lib;test" "D:/Programme/jruby-1.3.1/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake/rake_test_loader.rb"

On my Ruby projects all test are working fine.

I can right-click on a single test and run it with the correct test runner.