Path Is Not Closed
Origami needs a closed, continuous path around all the die-drawing graphics in its layer. It must be a cut line without any gaps. Origami uses this path to make a shape outline before it starts making holes and folding the shape.
What to check?
You have something like this somewhere in your die drawing:

You may not have such an obvious issue, but somewhere there is a gap in your outline path so the line is not continuous. Origami will mark the problem place with a small red cross, so look closer wherever you see that mark to identify and fix any gaps or overlaps. If you don’t see the issue immediately, check all the neighboring segments to find the problems.
Other reasons
The other reason you may get this error is if you have overlapping segments somewhere in your path. Overlaps are harder to find than gaps. Here is an example:

Looks good, but it actually isn’t:

This overlapping issue may happen to the inner path, as well:

What to do?
- Find the path that Origami has marked in red or identified with a red cross.
- Check if the path has gaps or overlaps.
- Fix errors you find, and keep fixing them until the error messages do not appear.
Want More Hints?
- Empty Layout — why there is no dieline visible?
- Path Is Not Closed — the dieline needs a solid, continuous outline path;
- Intersecting Holes — holes must not overlap;
- Overlapping Lines — cut and crease lines must not overlap, as well;
- Outside Hole — all holes must be inside the outline path;
- Invalid Crease — crease lines have limitations;
- Impossible Shape — some shapes simply don’t exist;
- Misaligned Elements — ends must meet, perfectly;
- Triangulation Failed — Origami fails to make a 3D mesh of a dieline;
- Z–Fighting — what to do with overlapping polygons.
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