hyperworks求解时出现错误OptiStruct/RADIOSS ERROR: 15

做静力分析，用hyperworks求解时出现错误OptiStruct/RADIOSS ERROR: 15具体错误描述如下：***** ERROR ENCOUNTERED BEFORE COMPLETING THE CHECK RUN ***** Current Memory (RAM) : 1009 MB Estimated Minimum Memory (RAM) for the check run : 1461 MBThis error occurred in subroutine prpdrv ***** FATAL ERROR ENCOUNTERED *****COMPUTE TIME INFORMATION------------------------ EXECUTION STARTED Mon Mar 29 17:14:41 2010 EXECUTION COMPLETED Mon Mar 29 17:15:21 2010 ELAPSED TIME 00:00:39 CPU TIME 00:00:39 ***** END OF REPORT *****For Useful OptiStruct Tips and Tricks, go to the URL: http://www.altair.com/support/tips/tip_os.htm OptiStruct/RADIOSS ERROR: 15希望高手朋友能给予解答，如何解决，万分感谢。
问题补充：
以为是内存问题，加了内存条，现在电脑是2.5G内存，软件和分析文件所在盘也都有足够空间，结果还是这个错误，希望高手能解决这个问题~~~ 高分求高手