将igs文件导入LT出现以下问题: z(1`Iy
M
c2:oM<6|
*** Error (AITX_BLANKED_ENTS) *** Ceew~n{
!xEGN@
The input file did not contain any supported non blanked independant entities. UZJ#/x5F
| *N;R+b
Please check the documentation for a list of supported entities. <AU0ir
pg{cZ1/
请教各位是什么原因,如何解决?