Sake error, I am getting

Hi,

I am getting following error when I run Sake…
Could u please tell how to correct this on my MacBook

$sake
/opt/local/lib/ruby/gems/1.8/gems/sake-1.0.10/lib/sake.rb:14: undefined method die' for main:Object (NoMethodError) from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:27:in gem_original_require’
from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:27:in `require’

    from /opt/local/lib/ruby/gems/1.8/gems/sake-1.0.10/bin/sake:3
    from /opt/local/bin/sake:16:in `load'
    from /opt/local/bin/sake:16

Thanks