Backbone.js with Django/Tastypie.. Uncaught TypeError: Cannot call method 'toJSON' of undefined on line 103?

app.js

var oldSync = Backbone.sync;
 
Backbone.sync = function(method, model, success, error){
    var newSuccess = function(resp, status, xhr){
        if(xhr.statusText === "CREATED"){
            var location = xhr.getResponseHeader('Location');
            return $.ajax({
                       url: location,
                       success: success
                   });
        }
        return success(resp);
    };
    return oldSync(method, model, newSuccess, error);
};

var Router = Backbone.Controller.extend({
  routes : {
    "": "home",
    "!/": "home",
    "!/library": "library",
    "!/library/": "library",
    "!/flooding": "flooding",
    "!/flooding/": "flooding",
  },
 
  home: function(id, next) {
      console.log("Home route called...");
      var hv = new HomeView;
      window.app.page(hv, "Home");
      next && next();
  },
  library: function() {
      console.log("Library route called...");
      var lv = new LibraryView;
      window.app.page(lv, "Library");
  },
  flooding: function() {
      console.log("Flooding route called...");
      var fv = new FloodingView;
      window.app.page(fv, "Flooding");
  }
});

window.App = Backbone.View.extend({
    initialize: function() {
        _.bindAll(this, 'render');
        console.log("Initializing window.App");
        this.locations = new Locations();
    },
    page: function(view, title) {
        title && (document.title = title);
        $(this.el).html(view.el);
        this.pageView = view;
        this.trigger('ready');
    },
});

window.HomeView = Backbone.View.extend({
    id: 'home',
    initialize: function() {
        console.log("Initializing HomeView");
        this.render();
    },
    render: function() {
        $(this.el).html(ich.home);
        return this;
    }
}); 

window.FloodingView = Backbone.View.extend({
    id: 'flooding',
    initialize: function() {
        console.log("Initializing FloodingView");
        this.render();
    },
    render: function() {
        $(this.el).html(ich.flooding);
        return this;
    }
});

window.Location = Backbone.Model.extend({
    url: function() {
        return this.get('resource_uri') || this.collection.url;
    }
});

window.Locations = Backbone.Collection.extend({
    url: FEWSLOCATION_API,
    parse: function(data) {
        return data.objects;
    }
});

window.LibraryView = Backbone.View.extend({
    id: 'library',
    initialize: function() {
        console.log("Initializing LibraryView");
        this.render();
    },
    render: function() {
        $(this.el).html(ich.library(this.model.toJSON()));
        return this;
    }
});

$(document).ready(function() {

    window.app = new App({
        el: $('#app')
    });
    var router = new Router; 
    Backbone.history.start();

	$('a[rel=tipsy]').tipsy({fade: true, gravity: 'n'});
});