Demo Error

Good afternoon, I was following the example of canvas 2d and I'm stuck with some demos that have problems (with the Babylon.js) and I came to report it.

Section https://doc.babylonjs.com/tutorials/using_the_canvas2d

All demos have the same fault, for example:

The simplest starting point would be created a ScreenSpace Canvas2D with a "Hello World!" text, here we go:

See it live in this playground - http://www.babylonjs-playground.com/#2AVSFH#35

Uncaught TypeError: e.Tools.getClassName is not a function
    at o.get [as modelKey] (babylon.canvas2d.min.js:4)
    at o.n._createModelRenderCache (babylon.canvas2d.min.js:7)
    at o.n._prepareRenderPre (babylon.canvas2d.min.js:6)
    at o.r._prepareRender (babylon.canvas2d.min.js:5)
    at n._prepareGroupRender (babylon.canvas2d.min.js:7)
    at n._updateCanvasState (babylon.canvas2d.min.js:11)
    at n._render (babylon.canvas2d.min.js:11)
    at e.callback (babylon.canvas2d.min.js:10)
    at e.notifyObservers (babylon.js:2)
    at r.render (babylon.js:10)