Final rendering throws an error while preview does not.

[masosnoski]

Trying to create a nipple that is threaded inside and out. It preview renders fine. When I do the final rendering in order to make an stl file, it throws the following error:

Parsing design (AST generation)...
Saved backup file: C:/Users/sosno/Documents/OpenSCAD/backups/LampAdapter-backup-yBChwxzl.scad
Compiling design (CSG Tree generation)...
Rendering Polygon Mesh using CGAL...
ERROR: CGAL error in CGALUtils::applyBinaryOperator difference: CGAL ERROR: assertion violation! Expr: target(s1).vertex()==target(s2).vertex() File: /mxe/usr/x86_64-w64-mingw32.static.posix/include/CGAL/Nef_3/SNC_FM_decorator.h Line: 227
Geometries in cache: 90
Geometry cache size in bytes: 67070304
CGAL Polyhedrons in cache: 2
CGAL cache size in bytes: 96450832
Total rendering time: 0:01:06.115
Top level object is a 3D object:
Simple: yes
Vertices: 19215
Halfedges: 112546
Edges: 56273
Halffacets: 74122
Facets: 37061
Volumes: 2
Rendering finished.

The Openscad script:

use <C:\Users\sosno\Documents\OpenSCAD\threads\threads.scad>

OutSidePitch=(1/20)25.4; // 20 threads/inch
InSidePitch=(1/27)25.4; // 27 threads/inch
Height = 26;
InsideDiameter = 3/825.4;
OutsideDiameter = 1/225.4;
TopThickness = 2;
//
// ScrewHole(3/8*25.4, 26, position=[0,0,0], rotation=[0,0,0], pitch=InSidePitch, tooth_angle=35, tolerance=0.4, tooth_height=1)
// ScrewThread(12.2, 26, pitch=OutSidePitch, tooth_angle=35, tolerance=0.4, tip_height=0, tooth_height=1, tip_min_fract=5)
// cylinder(h=26, d=12.2);
difference(){
union () {
ScrewThread(OutsideDiameter, Height, pitch=OutSidePitch, tooth_angle=35, tolerance=0.4, tip_height=0, tooth_height=1, tip_min_fract=5)
cylinder(h=26,d=OutsideDiameter);
// translate([0,0,Height-TopThickness])
cylinder(h=TopThickness, d=OutsideDiameter+4);
}
translate([0,0,-1.5])
ScrewThread(InsideDiameter, Height+3, pitch=InSidePitch, tooth_angle=35, tolerance=0.4, tip_height=0, tooth_height=1, tip_min_fract=5)
color("red") cylinder(h=Height+3, r=InsideDiameter);
}

I also tried creating it with the lines that are commented out, Same error.