将igs文件导入LT出现以下问题: &m^@9E)S/
(nSml,gU
*** Error (AITX_BLANKED_ENTS) *** ,ZE?{G{tuj
}M>rE
The input file did not contain any supported non blanked independant entities.
WY
<E,%@
Please check the documentation for a list of supported entities. ??qq: `s
jQs>`P-CM
请教各位是什么原因,如何解决?