怎么用hfss画椭圆柱？

怎么用hfss画椭圆柱?
我先画了个椭圆然后用了那个沿向量sweep结果报错

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[warning] Acis warning: "Faces always swept as solids." (3:33 下午 八月 04, 2008)
[error] Acis error: "Fail to call api_rsw_face_vec.. Acis Error 72027 - Path Curve tangential to the sweep profile " (3:33 下午 八月 04, 2008)
[error] Body could not be created for part because of invalid parameters to SweepAlongVector operation. (3:33 下午 八月 04, 2008)
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[

应该不会吧,我画都没问题.....