You’ve applied the Stitch Surfaces command to a surface body, but it didn’t create a solid body.
Usually this means there are gaps or missing surfaces.
Stitch the Surfaces
If you’ve already applied the Stitch Surfaces command, then undo the operation. You need to be able to apply a new stitch operation to solve this problem. Open the Stitch Surfaces command, select all the surfaces, and then click the Apply button.
Find the Edges with Gaps
The Find Remaining Free Edges window shows all…
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