allegro导入网络表出现问题，请帮忙看看。

这是一块要改的板子，原理图做好后，生成了网表，可是导网表时怎么也导不进去。新建一个新的BRD，居然又可以导。郁闷啊。。请大家帮帮忙。。
ERROR如下：
Program has encountered a problem and must exit.The database will be saved(if applicable).Obtain the lastest sofeware update from Cadence and if problem persists contact Cadence Customer Support.