将igs文件导入LT出现以下问题: -nXlW
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*** Error (AITX_BLANKED_ENTS) *** Bmt^*;WY+
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The input file did not contain any supported non blanked independant entities. }i{A4f`
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Please check the documentation for a list of supported entities. %Ai' 6
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请教各位是什么原因,如何解决?