Oracle 如何修复enterprise manager配置失败？

由于以下错误，Enterprise manager配置失败-

错误更新 /u01/app/oracle/product/11.2.0/db_1/sysman/emd/targets.xml

然后作为sysdba

drop user sysman cascade;
drop public synonym system;
drop role mgmt_user;
drop public synonym mgmt_target_blackouts;
drop user mgmt_view;

然后

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您好，错误消息所指的日志文件是什么？如果您没有查看，它可能会解决您的问题。您是否尝试手动运行/u01/app/oracle/product/11.2.0/db_1/bin/emca脚本？

drop user sysman cascade;
drop public synonym system;
drop role mgmt_user;
drop public synonym mgmt_target_blackouts;
drop user mgmt_view;

  emca -config dbcontrol db -repos create