导入dxf错误，请教怎么解决！

导入时出现错误如下：
Reading Layer Conversion File
Reading DXF file...
Error reading line of DXF file
Line number 1 of dxf file.
done.
ERROR: No data read.  Terminating program.
读取DXF路线错误?不明白什么意思！

发DXF看看吧。