EMKEY problems in Oracle RAC 11gR2

Oracle database 11gR2 (RAC 2 nodes)
O.S.: Redhat 5.3


1) After do a duplicate database in another host  i was unable to start Enterprise Manager Console. I got an error about EMKEY file corruption.

[oracle@fran ~]$ emctl status emkey
Oracle Enterprise Manager 11g Database Control Release 11.2.0.3.0
Copyright (c) 1996, 2011 Oracle Corporation.  All rights reserved.
Please enter repository password:

The Em Key is not configured properly or is corrupted in the file system and does not exist in the Management Repository. To correct the problem:
1) Copy the emkey.ora file from another OMS or backup machine to the OH/sysman/config directory.
2) Configure the emkey.ora file by running "emctl config emkey -emkeyfile <emkey.ora file location>".

2) I went to ORACLE_HOME/<host>_<sid>/sysman/config  directory and look for emkey.ora, It exists but when i tried to run "emkey config emkey -emkeyfile <emkey.ora file location>" it shows:

The Em Key could not be configured. /u01/app/oracle/product/11.2.0.3/dbhome_1/fran_orcl/sysman/config/emkey.ora is corrupted or contains an invalid Em Key.

So i replaced this emkey.ora from an older emkey.ora but it shows again the same error:

 The Em Key could not be configured. /u01/app/oracle/product/11.2.0.3/dbhome_1/fran_orcl/sysman/config/emkey.ora is corrupted or contains an invalid Em Key.

3) My next try was configure manually but again it shows an error:

[oracle@fran config]$ emctl config emkey -repos -sysman_pwd oracle -emkeyfile /u01/app/oracle/product/11.2.0.3/dbhome_1/fran_orcl/sysman/config/emkey.ora
Oracle Enterprise Manager 11g Database Control Release 11.2.0.3.0
Copyright (c) 1996, 2011 Oracle Corporation.  All rights reserved.

The Em Key could not be configured. The Em Key was not found in Management Repository.

4) If Em Key wasn't found in Management Repository you only have one way to resolve, recreate Repository...

You can check how to recreate repository in this blog: How To Recreate Oracle Repository