expdp遇到ORA-39126错误

Oracle数据库是11.2.0.4的RAC，在其中一个节点上面进行expdp,报以下错误：Estimate in progress using BLOCKS method...ORA-3912

问题描述：
Oracle数据库是11.2.0.4的RAC，，在其中一个节点上面进行expdp,报以下错误：

Estimate in progress using BLOCKS method...
ORA-39126: Worker unexpected fatal error in KUPW$WORKER.FETCH_XML_OBJECTS []
ORA-00904: : invalid identifier

ORA-06512: at "SYS.DBMS_SYS_ERROR", line 86
ORA-06512: at "SYS.KUPW$WORKER", line 9710

----- PL/SQL Call Stack -----
object line object
handle number name
0x104ec64fb0 21979 package body SYS.KUPW$WORKER
0x104ec64fb0 9742 package body SYS.KUPW$WORKER
0x104ec64fb0 11838 package body SYS.KUPW$WORKER
0x104ec64fb0 14674 package body SYS.KUPW$WORKER
0x104ec64fb0 2734 package body SYS.KUPW$WORKER
0x104ec64fb0 10422 package body SYS.KUPW$WORKER
0x104ec64fb0 1824 package body SYS.KUPW$WORKER
0x10373876f8 2 anonymous block

Estimate in progress using BLOCKS method...
ORA-39126: Worker unexpected fatal error in KUPW$WORKER.FETCH_XML_OBJECTS []
ORA-00904: : invalid identifier

ORA-06512: at "SYS.DBMS_SYS_ERROR", line 86
ORA-06512: at "SYS.KUPW$WORKER", line 9710

----- PL/SQL Call Stack -----
object line object
handle number name
0x104ec64fb0 21979 package body SYS.KUPW$WORKER
0x104ec64fb0 9742 package body SYS.KUPW$WORKER
0x104ec64fb0 11838 package body SYS.KUPW$WORKER
0x104ec64fb0 14674 package body SYS.KUPW$WORKER
0x104ec64fb0 2734 package body SYS.KUPW$WORKER
0x104ec64fb0 10422 package body SYS.KUPW$WORKER
0x104ec64fb0 1824 package body SYS.KUPW$WORKER
0x10373876f8 2 anonymous block

解决方法：
grant execute on DBMS_METADATA to public;

执行之后再次进行导出就没再报错了。

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