将igs文件导入LT出现以下问题: bv^wE,+?o
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*** Error (AITX_BLANKED_ENTS) *** Nl]_Ie6
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The input file did not contain any supported non blanked independant entities. B>}B{qi|
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Please check the documentation for a list of supported entities. 4A0v>G`E*#
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请教各位是什么原因,如何解决?