Hi Scott, the problem there is that you're probably trying to sweep both of those profile curves all during the same single sweep operation.
That won't work for sweep because sweep only expects for there to be multiple profile curves when they are at different stations along the curve, like different shapes for the sweep profile to morph between as they travel along the path.
So sweep does not expect to get 2 curves at one single station like that, it does not not know itself how to directly make a hollowed out shape in one single sweep.
You will need to either 2 different sweeps to construct the outside and inside parts separately and then use boolean difference to cut the inner one away from the outer one, or sweep just the outer one and use Construct > Offset > Shell to hollow it out.
In the future at some point I would like to make it possible for sweep to do the kind of multi-profile hollowed out sweep all in one go like you are trying to do there, but for now at least it does not understand that and so you have to do 2 sweeps for that instead.
- Michael
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