var role3D: Laya.Sprite3D = Laya.loader.getRes("res/lk4.lh") as Laya.Sprite3D;
//加载到场景
scene.addChild(role3D);  //此处报错
var ani = role3D.getComponent(Laya.Animator) as Laya.Animator;

//播放攻击状态
ani.play();
chrome 调试：

 addChild(node) {
            if (!node || this.destroyed || node === this)
                return node;
            if (node._zOrder)
                this._setBit(Const.HAS_ZORDER, true);
            if (node._parent === this) {
                var index = this.getChildIndex(node);
                if (index !== this._children.length - 1) {
                    this._children.splice(index, 1);
                    this._children.push(node);
                    this._childChanged();
                }
            }
            else {
                node._parent && node._parent.removeChild(node);
                this._children === Node.ARRAY_EMPTY && (this._children = []);
                this._children.push(node);
                node._setParent(this);  //在此处抛出异常
                this._childChanged();
            }
            return node;
        }

附件：
3d_test.rar

3d_test.rar