$ gem list aslak
*** LOCAL GEMS ***
aslakhellesoy-cucumber (0.3.7)
$ gem list cucumber # empty
$ rake...
can't convert Cucumber::Formatter::ColorIO into String (TypeError)
/Library/Ruby/Gems/1.8/gems/aslakhellesoy-cucumber-0.3.7/bin/../lib/cucumber/formatter/junit.rb:69:in `join'
/Library/Ruby/Gems/1.8/gems/aslakhellesoy-cucumber-0.3.7/bin/../lib/cucumber/formatter/junit.rb:69:in `convert_to_file_name'
/Library/Ruby/Gems/1.8/gems/aslakhellesoy-cucumber-0.3.7/bin/../lib/cucumber/formatter/junit.rb:40:in `visit_feature_name'
/Library/Ruby/Gems/1.8/gems/aslakhellesoy-cucumber-0.3.7/bin/../lib/cucumber/ast/feature.rb:20:in `accept'
/Library/Ruby/Gems/1.8/gems/aslakhellesoy-cucumber-0.3.7/bin/../lib/cucumber/ast/visitor.rb:23:in `visit_feature'
/Library/Ruby/Gems/1.8/gems/aslakhellesoy-cucumber-0.3.7/bin/../lib/cucumber/formatter/junit.rb:22:in `visit_feature'
/Library/Ruby/Gems/1.8/gems/aslakhellesoy-cucumber-0.3.7/bin/../lib/cucumber/ast/features.rb:21:in `accept'
/Library/Ruby/Gems/1.8/gems/aslakhellesoy-cucumber-0.3.7/bin/../lib/cucumber/ast/features.rb:20:in `each'
/Library/Ruby/Gems/1.8/gems/aslakhellesoy-cucumber-0.3.7/bin/../lib/cucumber/ast/features.rb:20:in `accept'
/Library/Ruby/Gems/1.8/gems/aslakhellesoy-cucumber-0.3.7/bin/../lib/cucumber/ast/visitor.rb:19:in `visit_features'
/Library/Ruby/Gems/1.8/gems/aslakhellesoy-cucumber-0.3.7/bin/../lib/cucumber/broadcaster.rb:9:in `__send__'
/Library/Ruby/Gems/1.8/gems/aslakhellesoy-cucumber-0.3.7/bin/../lib/cucumber/broadcaster.rb:9:in `method_missing'
/Library/Ruby/Gems/1.8/gems/aslakhellesoy-cucumber-0.3.7/bin/../lib/cucumber/broadcaster.rb:8:in `map'
/Library/Ruby/Gems/1.8/gems/aslakhellesoy-cucumber-0.3.7/bin/../lib/cucumber/broadcaster.rb:8:in `method_missing'
/Library/Ruby/Gems/1.8/gems/aslakhellesoy-cucumber-0.3.7/bin/../lib/cucumber/cli/main.rb:41:in `execute!'
/Library/Ruby/Gems/1.8/gems/aslakhellesoy-cucumber-0.3.7/bin/../lib/cucumber/cli/main.rb:20:in `execute'
/Library/Ruby/Gems/1.8/gems/aslakhellesoy-cucumber-0.3.7/bin/cucumber:8
rake aborted!