mask not run?

i create mask in my game but in some pc, it not run? Here my code

that.mask = new Sprite(TextureCache["mask"]);
        that.mask.position.set(that.size[0] / 2 - 8, that.size[1] / 2 - 12);
        that.mask.anchor.set(0.5);
        that.mainContainer.addChild(that.mask);
        that.mainContainer.mask = that.mask;