unexpected results when trying to scrape page contents

I'm trying to get a summary of some random content, but I'm always getting `ok: false` and no results.

> _Tuesday was the "official" opening night for the Progress, the long-awaited, much-anticipated sequel to State Bird Provisions. The Progress is directly next door to State Bird, a fact that becomes evident from within the Progress when the line for State Bird decides to extend southbound for an evening._

Here's my simple Node test case (using `"summarize": "1.5.0"`):

``` js
var summarize = require('summarize');

console.log(summarize("

And my output is:

```
$ node summary
{ ok: false,
sentiment: 0,
title: null,
topics: [],
words: 0,
difficulty: 0,
minutes: 0,
image: null }
```