ALLEGRO 导网络出现以下问题,请教高手如何解决？

大家好,我是新手用ALLEGRO 15.7 导入网络时出现以下提示,不知道错在哪,请教各位高手帮忙解决.

Cadence Design Systems, Inc. netrev 15.7 Fri Jul 08 15:35:43 2011
(C) Copyright 2002 Cadence Design Systems, Inc.
------ Directives ------
RIPUP_ETCH FALSE;
RIPUP_SYMBOLS ALWAYS;
MISSING SYMBOL AS ERROR FALSE;
SCHEMATIC_DIRECTORY 'E:/GG WORK FILE/MID/T1/ALLEGRO';
BOARD_DIRECTORY '';
OLD_BOARD_NAME 'E:/gg work file/MID/t1/MID7019-256M-BMP-140-R258-V2.1-0429-1000.brd';
NEW_BOARD_NAME 'E:/gg work file/MID/t1/MID7019-256M-BMP-140-R258-V2.1-0429-1000.brd';
CmdLine: netrev -$ -5 -i E:/GG WORK FILE/MID/T1/ALLEGRO -y 1 -z E:/gg work file/MID/t1/#Taaaaaa03156.tmp
------ Preparing to read pst files ------
Starting to read E:/GG WORK FILE/MID/T1/ALLEGRO/pstchip.dat
   Finished reading E:/GG WORK FILE/MID/T1/ALLEGRO/pstchip.dat (00:00:00.03)
Starting to read E:/GG WORK FILE/MID/T1/ALLEGRO/pstxprt.dat
   Finished reading E:/GG WORK FILE/MID/T1/ALLEGRO/pstxprt.dat (00:00:00.04)
Starting to read E:/GG WORK FILE/MID/T1/ALLEGRO/pstxnet.dat
   Finished reading E:/GG WORK FILE/MID/T1/ALLEGRO/pstxnet.dat (00:00:00.04)
------ Oversights/Warnings/Errors ------
#1   ERROR(102) Run stopped because errors were detected
netrev run on Jul 8 15:35:43 2011
   DESIGN NAME : 'MID7_256M_7INCH_V01'
   PACKAGING ON May 28 2006 22:05:31
   COMPILE 'logic'
   CHECK_PIN_NAMES OFF
   CROSS_REFERENCE OFF
   FEEDBACK OFF
   INCREMENTAL OFF
   INTERFACE_TYPE PHYSICAL
   MAX_ERRORS 500
   MERGE_MINIMUM 5
   NET_NAME_CHARS '#%&()*+-./:=>?@[]^_`|'
   NET_NAME_LENGTH 24
   OVERSIGHTS ON
   REPLACE_CHECK OFF
   SINGLE_NODE_NETS ON
   SPLIT_MINIMUM 0
   SUPPRESS   20
   WARNINGS ON
  1 errors detected
No oversight detected
No warning detected
cpu time      2:44:53
elapsed time  0:01:39

自己解决了, place chaged component  原来选 alwanys 改为 if same symbol 就可以成功导入,但不知道选这个是什么功能,如果有知道的望回复下

if same symbol 相同的元件就不摆入
alwanys 总是摆入

回复 zhouqingmin 的帖子
但是好像默认的就是always，也没出现以上说的问题么?