BackboneJS - Cannot call method 'on' of undefined - backbone.js

Question

I have this simple BackboneJS app and it keeps returning this error on adding new model to collection: Cannot call method 'on' of undefined. Can someone help me. I can't see the problem in here.I have my templates defined in index.html, and I am using Slim framework and NotORM.
(function(){
window.App =
{
Models:{},
Collections: {},
Views : {}
}
window.template = function(id)
{
return _.template( jQuery('#' + id).html());
}
App.Models.Party = Backbone.Model.extend({
});
App.Collections.Partys = Backbone.Collection.extend({
model: App.Models.Party,
url: "http://localhost/BackboneJS/vjezba6/server/index.php/task"
});
App.Views.Party = Backbone.View.extend({
tagName :"div",
className: "box shadow aktivan",
template: template("boxovi"),
initialize: function()
{
this.model.on('change', this.render, this);
},
events:{
"click .izbrisi" : "izbrisi"
},
render: function()
{
var template = this.template( this.model.toJSON() );
this.$el.html(template);
return this;
},
izbrisi: function()
{
this.model.destroy();
},
ukloni: function()
{
this.remove();
}
});
App.Views.Partys = Backbone.View.extend({
tagName:"div",
id: "nosac-boxova",
initialize: function()
{
},
render: function() {
this.collection.each(this.addOne, this);
return this;
},
addOne: function(party) {
var partyView = new App.Views.Party({ model: party });
this.$el.append(partyView.render().el);
}
});
App.Views.Dodaj = Backbone.View.extend({
tagName: "div",
template : template("dodajTemp"),
events:
{
'submit' : 'submit'
},
submit : function(e)
{
e.preventDefault();
console.log(e);
var nazivPolje = $(e.currentTarget).find(".naziv").val();
var tekstPolje = $(e.currentTarget).find(".lokal").val();
var noviParty = new App.Views.Party({naziv:nazivPolje, tekst: tekstPolje});
this.collection.create(noviParty);
},
initialize: function()
{
},
render: function()
{
var template = this.template();
this.$el.html(template);
return this;
}
});
/* var kolekcijaPartya = new App.Collections.Partys([
{
naziv:"Ovo je prvi naziv",
tekst: "Ovo je prvi tekst"
},
{
naziv:"Ovo je drugi naziv",
tekst: "Ovo je drugi tekst"
}
]);*/
var kolekcijaPartya = new App.Collections.Partys;
kolekcijaPartya.fetch({
success: function()
{
var partysView = new App.Views.Partys({collection:kolekcijaPartya});
$("#content").prepend(partysView.render().el);
$("div.box").slideAj();
var dodajView = new App.Views.Dodaj({collection: kolekcijaPartya});
$("div#sidebar-right").html(dodajView.render().el);
}
});
})();

Answer 1

var noviParty = new App.Views.Party({naziv:nazivPolje, tekst: tekstPolje});
this.collection.create(noviParty);
so you are trying to add a View to your collection?