Ionic 2 serve error - app.ts - Cannot find name 'Type'

I'm following theIonic 2 tutorial steps.

I started like this :

ionic start MyIonic2Project tutorial --v2 --ts

I encountered this problem :

	√ Sass compilation complete
	√ HTML copied to www/build
	√ Fonts copied to www/build/fonts

	Hash: e593a886038813766c87
	Version: webpack 1.12.10
	Time: 7150ms
	        Asset     Size  Chunks             Chunk Names
	app.bundle.js  2.67 MB       0  [emitted]  main
	   [0] multi main 64 bytes {0} [built]
	    + 359 hidden modules

	ERROR in [default] /Users/christianbonato/MyIonic2Project/app/app.ts:13:42
	Cannot find name 'Type'.

	ERROR in [default] /Users/christianbonato/MyIonic2Project/node_modules/ionic-framework/animations/animation.d.ts:48:50
	A 'this' type is available only in a non-static member of a class or interface.

	ERROR in [default] /Users/christianbonato/MyIonic2Project/node_modules/ionic-framework/animations/animation.d.ts:54:50
	A 'this' type is available only in a non-static member of a class or interface.

	√ Webpack complete

	∆ Starting dev server.

The webserver launches alright, but I'd rather fix these errors,
I don't know if the app may suffer later.

The errors in animation.d.ts were solved thanks to this.

The only error left is this one :

ERROR in [default] /Users/christianbonato/MyIonic2Project/app/app.ts:13:42
	Cannot find name 'Type'.

Any ideas on how to fix this?