help with using greensock tweengroup and tweenmax

It is the first tiem I use tweenGroup
I must be doing something wrong since it's not working.

import gs.TweenLite;
import gs.easing.*;
 
 
 
W.x.onPress = function() {
	TweenGroup.allTo([W.one, W.two, W.three, W.four], 1, {y:"100", alpha:0, stagger:0.2});
};

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