exp错误

Export: Release 9.2.0.1.0 - Production on 星期一 6月 20 15:24:15 2005

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EXP-00056: 遇到 ORACLE 错误 19206
ORA-19206: Invalid value for query or REF CURSOR parameter
ORA-06512: at "SYS.DBMS_XMLGEN", line 83
ORA-06512: at "SYS.DBMS_METADATA", line 345
ORA-06512: at "SYS.DBMS_METADATA", line 410
ORA-06512: at "SYS.DBMS_METADATA", line 449
ORA-06512: at "SYS.DBMS_METADATA", line 1156
ORA-06512: at "SYS.DBMS_METADATA", line 1141
ORA-06512: at line 1
EXP-00000: 导出终止失败

Executing the following as sys resolves the issue :

$ORACLE_HOME/rdbms/admin/catmeta.sql