将igs文件导入LT出现以下问题: J1,\Q<
%<x2=#0
*** Error (AITX_BLANKED_ENTS) *** [cSoo+Mlx
_7?LINF9
The input file did not contain any supported non blanked independant entities. B(<;]
Rk#@{_
Please check the documentation for a list of supported entities. `mU'{
^j1?L B
请教各位是什么原因,如何解决?