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。 - B& W# [ J1 F2 X4 j& }8 g请问一下,这是什么原因,应该怎么解决呢?谢谢! . q4 B9 j* i/ `. _7 `