将igs文件导入LT出现以下问题: [ \Aor[(
#kGxX@0
*** Error (AITX_BLANKED_ENTS) *** FkT% -I
6_a.`ehtj<
The input file did not contain any supported non blanked independant entities. 4^B:Q9B)
RbNRBK!{
Please check the documentation for a list of supported entities.
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) uyh
请教各位是什么原因,如何解决?