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Looks like there's some Ruby behind the scenes.

``` Error: undefined method `each' for nil:NilClass ```

On bluemix (the IBM PaaS) you can use Ruby, node.js, etc. So they probably chose Ruby as the language for the example.

More details? Which service? What were you doing with it?

i changed Corpus to "Social Media" and hit "Submit".

i refreshed the page and did the same thing and it worked.

Yep - that's where i got it too.