Object #<Object> has no method 'find'

On windows when i run the following code:

```
    var FileFinder = require('../lib/FileFinder');
    fnd = new FileFinder({
      scanDirs: [workingDir],
      extensions: ['.js'],
      useNative: true,
      ignore: null
    });

    fnd.find(function(files){
      console.log('done');
    });
```

i got the following error: `TypeError: Object #<Object> has no method 'find'`