MEPover create pipe failed

Hello everyone, I used Pipe.Bylines in MEPover to create a pipeline and output it as a valid pipe element, but Revit shows an error and forcibly deletes it, why is it? Can you help with the answer?[quote=“864686139, post:1, topic:109509, full:true”]
Hello everyone, I used Pipe.Bylines in MEPover to create a pipeline and output it as a valid pipe element, but Revit shows an error and forcibly deletes it, why is it? Can you help with the answer?
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that error should’ve said something. what is it?