i didn't get error message successfully created loft . make sure you draw profile at the ends.
The geometry you try to use has multiple issues.
For starters, you have a 26.5mm profile starting height, and try to use a 25.4mm pitch. It cannot work because it would create a self-intersecting feature.
Also you need a variable pitch spiral, because the profile height increases as moving along the centerline.
Something like that:
(Could be better looking, I made it fast)
The profile can change within the path in sweep if you use guide curves and pierce a point from the profile on it/them.
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