[Gmsh] Error : Self intersecting surface mesh, computing intersections (this could take a while)

[Steffen Becker]

Hello everyone,

I'm a gmsh beginner and I want to create a 3D volume mesh out of a given 
surface-mesh but I got the error message as seen in the subject. You 
find my .geo file in the appendix.
Can anyone tell me what I have to do to create a 3D mesh? I even can't 
figure out where the intersection are located (don't know how to read 
the intersect.pos).
Sorry for my poor english.

Regards,
Steffen
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Merge "my_file.ply2";
Surface Loop(2) = {1};
Volume(3) = {2};