将igs文件导入LT出现以下问题: Ct0YwIR*
H*vd
*** Error (AITX_BLANKED_ENTS) *** N)o/}@]6
z-`-0@/A$
The input file did not contain any supported non blanked independant entities. w0YV87
mH5[(?
Please check the documentation for a list of supported entities. T5? eb"
BiCC72oig
请教各位是什么原因,如何解决?