Backbone.Marionette has no method 'bindTo'
===

Trying Marionette for the first time.
Following the example here: 

https://github.com/derickbailey/backbone.marionette/blob/master/docs/marionette.itemview.md#binding-to-itemview-events

I get this error:

    Uncaught TypeError: Object [object Object] has no method 'bindTo'

I have also tried copy/pasting the entire code snippet from the example, this also throws that error. So what am I missing?

