Create closed polysurface

Rhino Rhino for Windows
1

I try to create a closed polysurface from the surfaces in the attached file, but that fails.
How can I create a closed polysurface or check why that fails?roof.3dm (139.8 KB)

2

it has one lillet naked Edge, to solve it Run RemoveAllNakedMicroEdges

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3

Thanks! that did the trick!