在运行par命令时，有一个FATAL_ERROR，不知道怎么去掉，请大家看看。 par, ERROR, FATAL, 命令, 运行

keceel

FATAL_ERROR:NetListWritersortability/export/Port_Main.h:127:1.3 - This
   application has discovered an exceptional condition from which it cannot
   recover.  Process will terminate. For more information on this error, please
   consult the Answers Database or open a WebCase with this project attached at
   http://www.xilinx.com/support.

这个错误什么意思啊？？？哪方面出了问题呢？？？