Backbone.js: `extend` undefined?

Backbone.js: `extend` undefined?

Just getting started with Backbone.js. Simply including Backbone (either dev/production versions) causes the error:

Just getting started with Backbone.js. Simply including Backbone (either dev/production versions) causes the error:

Uncaught TypeError: Cannot call method 'extend' of undefined on Line 128:

// Attach all inheritable methods to the Model prototype
_.extend(Backbone.Model.prototype, Backbone.Events, 


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