sweep error

 From:  wimverbe
I have this profile, and want to sweep it around a simple L path. the profile is completely closed, well formed, (I even redrew it from scratch to make shure) and yet, the sweep does not generate a closed volume, but 4 separate sweeps, which cannot be joined and a cap added. if I extrude the profile, it works fine. the problem is with the 2 smallest arcs in the profile, if I remove them and replace them with straight lines, it works. any idea how to solve this?

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