Problem creating a "solid object" (.3dm model attached)

 From:  tennet (FREDERIK)
11701.2 In reply to 11701.1 
Here is a new version of the model. It's just a SWEEP between 3 profile curves (closed curves). I can't close the bottom hole using "Planar" or "Network" (Yellow selection in the screenshot).

This is probably very simple to do, but I can't figure out how to make this a SOLID?

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