When I try to cut the fuse this message appears in Assembly window: The foil AG17 has an open trailing edge. Cannot make a solid of wing Main Wing due to its open trailing edge. What shall I do? At trailing point I put vertical coordinates 0.000; 0.000
This is one of the limitations of the underlying OpenCascade libraries: they require the cutting tools to be closed.See for example this video at 4:10. You will need to modify the foils to force a closed trailing edge.
Because this Q&A section is not very handy, I’ll send you a direct contact address for future questions and bug reports.