Can't attach to unregistered anchor with id list

I am following the steps writed in the page

1. Add <tour-step-template></tour-step-template> to your root app component
2. Define anchor points for the tour steps by adding the tourAnchor directive throughout your app. <div tourAnchor="some.anchor.id">...</div>
3. Define your tour steps using tourService.initialize(steps)

this.tourService.initialize([{
  anchorId: 'some.anchor.id',
  content: 'Some content',
  title: 'First',
}, {
  anchorId: 'another.anchor.id',
  content: 'Other content',
  title: 'Second',
}]);

1. Start the tour with tourService.start()
2. Check out the demo source code for an example.

Why i get the error Can’t attach to unregistered anchor with id myId