昨天在设计月球科技馆概念图时用扫掠拉伸功能画完了十几道曲形的结构长板，画最后几道时突然扫掠拉伸功能失效，我按照软件提示一直没有排除故障，现在无论是手动还是自动，扫掠拉伸功能都不工作，请给予指点。
Google Translation:
Yesterday, when I was designing the concept drawing of the Lunar Science and Technology Museum, I used the sweep and stretch function to draw more than a dozen curved structural long boards. When I was drawing the last few lines, the sweep and stretch function suddenly failed. I followed the software prompts and still failed to troubleshoot. Now, Whether it is manual or automatic, the sweep stretch function is not working, please give me some advice.
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