Comment 4 for bug 1123907

the dxf file appears to be either Release 11 or 12. (One way to check the Release version is to check the variable $ACADVER
 which is AC1009 in this case. )
The current dxf import routine does not support Release 12, only Release 13 and newer.
One way to convert from Release 12 to 13 is to use QCad. The default save format in QCad is Release 13. (An alternative way might be to specify Release 13 when you save the file from your software.)
I have imported this dxf file into QCad and then saved it to produce the attached dxf file. This imports into Inkscape with no errors.