在导出数据库时报错，如何处理？

hider

操作系统：HP-UX11.0
数据库：ORACLE8.1.5
使用命令：exp system/manager file=/arch/sys.dmp full=y rows=n
错误报告：
. exporting bitmap, functional and extensible indexes
. exporting posttables actions
EXP-00008: ORACLE error 1403 encountered
ORA-01403: no data found
ORA-06512: at "SYS.DBMS_AQ_IMPORT_INTERNAL", line 77
ORA-06512: at line 1
ORA-06512: at "SYS.DBMS_SYS_SQL", line 781
ORA-06512: at "SYS.DBMS_SQL", line 316
ORA-06512: at "SYS.DBMS_EXPORT_EXTENSION", line 82
ORA-06512: at "SYS.DBMS_EXPORT_EXTENSION", line 133
ORA-06512: at line 1
EXP-00000: Export terminated unsuccessfully