关于导入DXF

各位大侠：请问一下，我在导入DXF时，出现以下提示:
Reading Layer Conversion File
Reading DXF file...
NOTE: Replacing illegal character $ with X in $MODEL_SPACE.
NOTE: Replacing illegal character $ with X in $PAPER_SPACE.
NOTE: Replacing illegal character * with X in *U0.
NOTE: Replacing illegal character * with X in *U1.
NOTE: Replacing illegal character * with X in *U2.
NOTE: Replacing illegal character * with X in *U3.
NOTE: Replacing illegal character * with X in *U0.
NOTE: Replacing illegal character * with X in *U1.
NOTE: Replacing illegal character * with X in *U2.
NOTE: Replacing illegal character * with X in *U3.
done.
WARNING:  Unsupported curve-fit, spline, or 3D POLYLINE on line 4268
Layer conversion file: E:/CTV-002_TPC/PCB Structure/CTV_DC_FPC_20140425-1_l.cnv
DXF file: E:/CTV-002_TPC/PCB Structure/CTV_DC_FPC_20140425-1.dxf
BRD file: #Taaaaab04992.tmp
Update existing design?: NO
Use default text?: NO
DXF units: MILLIMETERS
Design units: MILS
Design precision: 4
dxf2a complete.
不知道是什么问题，请大侠指点一下，谢谢！

发你的DXF文件， 我来试试

提示非法字符，貌似只有一些警告