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。 8 s/ D* J5 V4 Q请问一下,这是什么原因,应该怎么解决呢?谢谢! 8 t" C; p W4 _7 M2 M, w* D4 A