Non-mappable solid problem

Hi,

I'm quite new at hypermesh. I'm tryign to mesh a tiny vascular stent which radius is only 3.5mm.

When I tried to mesh by 3D mehsing, it showed'Non-mappable,along face from 0 loops, need2'.

Is this problem due to the complex geometry?

if you guys find out what my solution is i'd be appreciated,

Thanks for the helps.

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