将igs文件导入LT出现以下问题: q_T]9d
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*** Error (AITX_BLANKED_ENTS) *** '@TI48 J+
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The input file did not contain any supported non blanked independant entities. Zx+cvQ
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Please check the documentation for a list of supported entities. (=1q!c`
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请教各位是什么原因,如何解决?