Sprinkler loft problem : mixed open/close

Hi guys,

I'm trying to loft a plastic base for a typical sprinkler, you can see a pic attached to this mail.

Soldiworks says that loft sections must all be closed or all be open and I cant figure out whats the problem, help please? solid file attached

First sketchec are the base and the 4 last ones are guide lines.

Thanks!

Sharon

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