Whats wrong with this simple dxf?

I wrote a program a couple of years ago, that creates dxf files.
But those dxf files wont load in Autocad 2000. (Autocad Map 2000i)
And I can't figure out why. My very simple dxf looks like this:

0
SECTION
2
ENTITIES
0
LWPOLYLINE
8
MY_LAYER_NAME
10
117.0833862479526
20
236.273196326125
10
312.3927936853251
20
114.8195877336612
0
ENDSEC
0
EOF

The errormessage:
Undefined group code 10 for object on line 10.
Invalid or incomplete DXF input -- drawing discarded.

I have been looking at Autocads site, and found some pdf-files with a
description of the dxf-format. But I still cant figure it out... I
also found an example of a program in the pdf-documentation that
created the folowing file, and it works! But I have to create a
PLINE!.

0
SECTION
2
ENTITIES
0
LINE
8
Polygon
10
11.7
20
18.9
11
6.12
21
7.16
0
ENDSEC
0
EOF

Please help me! I have been trying to figure this out the hole day,
and Im totally stucked. I found the dxf-documentation here:

http://www.autodesk.com/techpubs/autocad/

Thanks,
// Marcus

 

Hi! Your "MY_LAYER_NAME" may have spaces or other invalid characters. I have
fixed many times these with simple word processing by searching and
replacing these invalid layer names. After that the DXF usually loads with
no problems.

 

"MY_LAYER_NAME" doesn't have spaces, and even if it did, R2000 and up accepts spaces in table names.

 

header missing?

N.

 

The group 90 (Number of vertices) is missing.

Try:

0
SECTION
2
ENTITIES
0
LWPOLYLINE
8
MY_LAYER_NAME
90
2
10
117.0833862479526
20
236.273196326125
10
312.3927936853251
20
114.8195877336612
0
ENDSEC
0
EOF

regards
Dirk

 

I've the exact same problem with AutoCAD 2005 LT. I paste below the
simple dxf code.

Could it be that it needs header / dictionary ?
If anyone have any clue, that'd be a great help. Thanks much!!


0
SECTION
2
ENTITIES
0
LWPOLYLINE
5
2F
100
AcDbEntity
8
caming single mo mo
6
Continuous
100
AcDbPolyline
90
3
70
0
43
0.0
10
2.663232329117831
20
7.080058543318942
10
9.381858331151327
20
-0.8846364111031022
10
13.64245043782846
20
4.461528709355301
0
ENDSEC
0
EOF

 

I've the exact same problem. If you have any clue, do we need the whole
header or only certain group codes? Thanks!