拜求斑竹及各位高人都来看看吧。

我要使一物体沿着轨迹曲线运动，这个轨迹曲线怎么去创建？有几种方法？用construction Geometry：spline可以么？怎么老有这样的提示：
WARNING: The resulting body is not a valid manifold solid, it does not have any mass.
ERROR:      The system matrix has a zero pivot for column 7, which is associated
   with PART/3 Xdot.  Consequently, the matrix is numerically singular.
ERROR:   Abnormal termination encountered in Solver.
WARNING: The resulting body is not a valid manifold solid, it does not have any mass.
并且我在物体上和曲线上加了point-curve约束后，不能运动阿。
大家看看我做的对不对？曲线和加约束对不对？大家有没有别的好办法？

斑竹怎么不解答我这个问题啊？各位高人都来看看啊