error cucumber wit spork

/usr/local/bin/ruby /usr/local/lib/ruby/gems/1.8/gems/cucumber-0.5.1/bin/cucumber --format progress --format rerun --out /var/folders/WZ/WZPzXYGZH2yf3R-9h5iHCE+++TI/-Tmp-/autotest-cucumber20091217-31269-1ory6l5-0 features
/usr/local/lib/ruby/gems/1.8/gems/cucumber-0.5.1/lib/cucumber/cli/configuration.rb:171:in `arrange_formats': All but one formatter must use --out, only one can print to each stream (or STDOUT) (RuntimeError)
	from /usr/local/lib/ruby/gems/1.8/gems/cucumber-0.5.1/lib/cucumber/cli/configuration.rb:25:in `parse!'
	from /usr/local/lib/ruby/gems/1.8/gems/cucumber-0.5.1/lib/cucumber/cli/main.rb:94:in `configuration'
	from /usr/local/lib/ruby/gems/1.8/gems/cucumber-0.5.1/lib/cucumber/cli/main.rb:41:in `execute!'
	from /usr/local/lib/ruby/gems/1.8/gems/spork-0.7.4/lib/spork/test_framework/cucumber.rb:22:in `run_tests'
	from /usr/local/lib/ruby/gems/1.8/gems/spork-0.7.4/lib/spork/run_strategy/forking.rb:13:in `run'
	from /usr/local/lib/ruby/gems/1.8/gems/spork-0.7.4/bin/../lib/spork/forker.rb:20:in `initialize'
	from /usr/local/lib/ruby/gems/1.8/gems/spork-0.7.4/bin/../lib/spork/forker.rb:18:in `fork'
	from /usr/local/lib/ruby/gems/1.8/gems/spork-0.7.4/bin/../lib/spork/forker.rb:18:in `initialize'
	from /usr/local/lib/ruby/gems/1.8/gems/spork-0.7.4/lib/spork/run_strategy/forking.rb:9:in `new'
	from /usr/local/lib/ruby/gems/1.8/gems/spork-0.7.4/lib/spork/run_strategy/forking.rb:9:in `run'
	from /usr/local/lib/ruby/gems/1.8/gems/spork-0.7.4/lib/spork/server.rb:47:in `run'
	from /usr/local/lib/ruby/1.8/drb/drb.rb:1562:in `__send__'
	from /usr/local/lib/ruby/1.8/drb/drb.rb:1562:in `perform_without_block'
	from /usr/local/lib/ruby/1.8/drb/drb.rb:1522:in `perform'
	from /usr/local/lib/ruby/1.8/drb/drb.rb:1596:in `main_loop'
	from /usr/local/lib/ruby/1.8/drb/drb.rb:1592:in `loop'
	from /usr/local/lib/ruby/1.8/drb/drb.rb:1592:in `main_loop'
	from /usr/local/lib/ruby/1.8/drb/drb.rb:1588:in `start'
	from /usr/local/lib/ruby/1.8/drb/drb.rb:1588:in `main_loop'
	from /usr/local/lib/ruby/1.8/drb/drb.rb:1437:in `run'
	from /usr/local/lib/ruby/1.8/drb/drb.rb:1434:in `start'
	from /usr/local/lib/ruby/1.8/drb/drb.rb:1434:in `run'
	from /usr/local/lib/ruby/1.8/drb/drb.rb:1354:in `initialize'
	from /usr/local/lib/ruby/1.8/drb/drb.rb:1634:in `new'
	from /usr/local/lib/ruby/1.8/drb/drb.rb:1634:in `start_service'
	from /usr/local/lib/ruby/gems/1.8/gems/spork-0.7.4/lib/spork/server.rb:29:in `listen'
	from /usr/local/lib/ruby/gems/1.8/gems/spork-0.7.4/lib/spork/server.rb:20:in `run'
	from /usr/local/lib/ruby/gems/1.8/gems/spork-0.7.4/bin/../lib/spork/runner.rb:75:in `run'
	from /usr/local/lib/ruby/gems/1.8/gems/spork-0.7.4/bin/../lib/spork/runner.rb:9:in `run'
	from /usr/local/lib/ruby/gems/1.8/gems/spork-0.7.4/bin/spork:10
	from /usr/local/bin/spork:19:in `load'
	from /usr/local/bin/spork:19
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