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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