cuke4duke support has been dropped in favor of work on cucumber-jvm. Which is all well and good, except that cucumber-jvm isn’t fully baked yet. It’s not quite there regarding features, but it’s getting there fast.
Unfortunately, that means for those that are still using cuke4duke, you’ve got problems to deal with. The voodoo magic that is cuke4duke does not install gems very well. I don’t know precisely why this is, but it ends up with many problems. Things that will install just fine using a jruby command line, or in native ruby barf a horrible death. Often regarding some YAML::Syck thing.
ERROR: While executing gem ... (ArgumentError) undefined class/module YAML::Syck::DefaultKey