将igs文件导入LT出现以下问题: o-AF_N
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*** Error (AITX_BLANKED_ENTS) *** 5v`lCu]
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The input file did not contain any supported non blanked independant entities. ;mGPX~38
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Please check the documentation for a list of supported entities. _Y}cK|3
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请教各位是什么原因,如何解决?