将igs文件导入LT出现以下问题: E<.{
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*** Error (AITX_BLANKED_ENTS) *** )7 BNzj"~
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The input file did not contain any supported non blanked independant entities. UW~tS
A_dYN?^?|
Please check the documentation for a list of supported entities. s!zr>N"
s?gXp{O?X
请教各位是什么原因,如何解决?