将igs文件导入LT出现以下问题: u.m[u)HQ
g(7rTyp4)
*** Error (AITX_BLANKED_ENTS) *** ?_9
u(F_oZ~
The input file did not contain any supported non blanked independant entities. ~t~k2^)|"
fW1CFRHH
Please check the documentation for a list of supported entities. %axh`xK#
}?_?V&K|
请教各位是什么原因,如何解决?