"Undefined group code" in ELLIPSE

[Richard Coutts]

I'm generating my own DXF files to be loaded with AutoCAD and other CAD systems. My files load fine with the CAD systems I've tested, including AutoCAD R14, but when I try to load it with R15, it chokes on the ELLIPSE with the error "Undefined group code 10." I've tried everything I can think of to get the to work, but am at a loss. The file is about 20,000 lines. If I delete the 38 lines that contain the only Ellipse in the file, it loads into R15 fine. But if I leave it in, I get the error. Below are the 38 lines. If someone could clue me in, I'd be indebted.

Thanks!
Rich

0
ELLIPSE
5
256
100
AcDbEntity
8
1_MISC
100
AcDbEllipse
39
0
62
2
10
550.798950
20
709.608337
30
0.0
11
0.750000
21
0.000000
31
0.0
210
0.0
220
0.0
230
1.0
40
0.833333
41
0.000000
42
6.283185