更改原理图后,进行正标,提示错误:there are errors .see logfile.BackAnnotation.txt.logfile中提示如下:presumably,this design has never been forword annotated in the ICDB environment.BackAnnotation can not proceed。 ' \2 N8 |4 h3 D0 L2 F, r" [: k请问一下,这是什么原因,应该怎么解决呢?谢谢!! o" S6 m' _1 F# _