exp 时报错EXP-00008,ORA-00904，该如何解决？

ak47

我想将公司的数据通过EXP导出来备份，前段时间都是好的，可这次出问题了，我查看了错误信息，可它没有讲解决的方法，我该怎么做？
psb1>; exp

Export: Release 8.1.5.0.0 - Production on Mon Jun 28 09:15:43 2004

(c) Copyright 1999 Oracle Corporation.  All rights reserved.


Username: qygl/qygl@mis

Connected to: Oracle8i Enterprise Edition Release 8.1.5.0.0 - Production
With the Partitioning and Java options
PL/SQL Release 8.1.5.0.0 - Production
Enter array fetch buffer size: 4096 >; 8192

Export file: expdat.dmp >; 200406qygl.dmp  

(1)E(ntire database), (2)U(sers), or (3)T(ables): (2)U >;

Export grants (yes/no): yes >;

Export table data (yes/no): yes >;

Compress extents (yes/no): yes >;

Export done in ZHS16CGB231280 character set and ZHS16CGB231280 NCHAR character set

About to export specified users ...
User to be exported: (RETURN to quit) >; qygl

User to be exported: (RETURN to quit) >;  

. exporting pre-schema procedural objects and actions
. exporting foreign function library names for user SCGL
. exporting object type definitions for user QYGL
About to export QYGL's objects ...
. exporting database links
. exporting sequence numbers
. exporting cluster definitions
EXP-00008: ORACLE error 904 encountered
ORA-00904: invalid column name
EXP-00000: Export terminated unsuccessf
psb>;

novazhao

执行\rdbms\admin\catexp.sql应该就可以了