ember.js cannot set property 'store' of undefined - ember.js

Question

I have been trying to set up an Ember.js application together with a RESTful API i have created in Laravel.
I have encountered a problem trying to get the data trough the store, and depending on my implementation, I get different errors, but never any working implementations.
The ember.js guide have one example, other places have other examples, and most information I find is outdated.
Here's my current code:
App = Ember.Application.create();
App.Router.map(function() {
this.resource("world", function() {
this.resource("planets");
});
});
App.PlanetsRoute = Ember.Route.extend({
model: function() {
return this.store.find('planet');
}
});
App.Planet = DS.Model.extend({
id: DS.attr('number'),
name: DS.attr('string'),
subjectId: DS.attr('number')
});
And when I try to click the link for planets, thats when the error occurs, and I get the following error right now:
Error while loading route: TypeError {} ember-1.0.0.js:394
Uncaught TypeError: Cannot set property 'store' of undefined emberdata.js:15
No request is sent for /planets at all. I had it working with a $.getJSON, but I wanted to try to implement the default ember-data RESTAdapter.
For reference, these are some of the implementations i've tried:
var store = this.get('store'); // or just this.get('store').find('planet')
return store.find('planet', 1) // (or findAl()) of store.findAll('planet');
App.store = DS.Store.create();
I also tried DS.Store.all('planet') as I found it in the ember.js api, but seemed like I ended up even further away from a solution.
Most other implementations give me an error telling me there is no such method find or findAll.
EDIT (Solution)
After alot of back and forward, I managed to make it work.
I'm not sure exactly which step fixed it, but I included the newest versions available from the web (Instead of locally), and the sourcecode now looks like this:
window.App = Ember.Application.create();
App.Router.map(function() {
this.resource("world", function() {
this.resource("planets");
});
});
App.PlanetsRoute = Ember.Route.extend({
model: function() {
return this.store.findAll('planet');
}
});
App.Planet = DS.Model.extend({
name: DS.attr(),
subjectId: DS.attr()
});

Answer 1

The error you had is probably due to the fact that you added a "s" plural of your objects.
i.e. if you use
App.Planets = DS.Model.extend({
})
you would get that error.