Error with jruby-head and simplecov on shoes4

jruby-head_simplecov

tobi@speedy ~/github/shoes4 $ rake spec
jruby --debug --1.9 -Ispec  -S ./bin/rspec --tty   spec/shoes/list_box_spec.rb spec/shoes/sound_spec.rb spec/shoes/flow_spec.rb spec/shoes/border_spec.rb spec/shoes/app_spec.rb spec/shoes/button_spec.rb spec/shoes/edit_box_spec.rb spec/shoes/check_spec.rb spec/shoes/shape_spec.rb spec/shoes/animation_spec.rb spec/shoes/text_block_spec.rb spec/shoes/line_spec.rb spec/shoes/radio_spec.rb spec/shoes/framework_learning_spec.rb spec/shoes/progress_spec.rb spec/shoes/image_spec.rb spec/shoes/configuration_spec.rb spec/shoes/color_spec.rb spec/shoes/edit_line_spec.rb spec/shoes/logger_spec.rb spec/shoes/oval_spec.rb spec/shoes/background_spec.rb spec/shoes/logger/log4j_spec.rb spec/shoes/logger/ruby_spec.rb
LoadError: load error: pp -- java.lang.ArrayIndexOutOfBoundsException: -1
  require at org/jruby/RubyKernel.java:1018
   (root) at /home/tobi/.rvm/gems/jruby-head@shoes/gems/rspec-expectations-2.11.2/lib/rspec/expectations/differ.rb:3
  require at org/jruby/RubyKernel.java:1018
   (root) at /home/tobi/.rvm/gems/jruby-head@shoes/gems/rspec-expectations-2.11.2/lib/rspec/expectations.rb:1
  require at org/jruby/RubyKernel.java:1018
   (root) at /home/tobi/.rvm/gems/jruby-head@shoes/gems/rspec-expectations-2.11.2/lib/rspec/expectations.rb:10
  require at org/jruby/RubyKernel.java:1018
   (root) at /home/tobi/.rvm/gems/jruby-head@shoes/gems/rspec-2.11.0/lib/rspec.rb:1
  require at org/jruby/RubyKernel.java:1018
   (root) at /home/tobi/.rvm/gems/jruby-head@shoes/gems/rspec-2.11.0/lib/rspec.rb:2
  require at org/jruby/RubyKernel.java:1018
   (root) at /home/tobi/github/shoes4/spec/spec_helper.rb:1
     load at org/jruby/RubyKernel.java:1044
   (root) at /home/tobi/github/shoes4/spec/spec_helper.rb:6
  collect at org/jruby/RubyArray.java:2342
      map at org/jruby/RubyArray.java:2355
   (root) at /home/tobi/github/shoes4/spec/shoes/spec_helper.rb:1
   (root) at /home/tobi/github/shoes4/spec/shoes/spec_helper.rb:1
   (root) at /home/tobi/github/shoes4/spec/shoes/list_box_spec.rb:1
   (root) at /home/tobi/github/shoes4/spec/shoes/list_box_spec.rb:1
     call at org/jruby/RubyProc.java:261
     call at org/jruby/RubyProc.java:213
Coverage report generated for RSpec to /home/tobi/github/shoes4/coverage. 0 / 0 LOC (0.0%) covered.
rake aborted!
Command failed with status (1): [jruby --debug --1.9 -Ispec  -S ./bin/rspec...]

Tasks: TOP => spec:shoes
(See full trace by running task with --trace)