问当我在gradle任务中运行cucumber测试时，我得到了以下错误。我的ruby版本是: 2.2，cucumber版本是1.2.5

EN

Argument to bundle: [exec, cucumber, -p, default, ~@mask1, --format, junit, --out, STDOUT]

Successfully started process 'command 'bundle''

All but one formatter must use --out, only one can print to each stream (or STDOUT) (RuntimeError)

Gemfiles：

gem 'rake', '~>0.9.6', :require => false
gem 'rspec', '~> 2.0.0'
gem "capybara", "~> 1.1.2"
gem "selenium-webdriver", "~> 2.41.0"
gem 'cucumber', '~>1.2.5'

有人知道怎么修吗？