RCU Error and Solution: RCU-6130 action failed RCU-6136 Error while trying to execute SQLPlus action

Error: 
2013-05-04 14:34:55.544 ERROR rcu: oracle.sysman.assistants.rcu.backend.action.SQLPlusAction::perform: Error initializing SQLPlusEngine:
java.io.IOException: java.io.IOException: java.io.IOException: java.io.IOException: java.io.IOException: java.io.IOException: java.io.IOException: java.io.IOException: java.io.IOException: java.io.IOException: java.io.IOException: java.io.IOException: Error initializing sqlplus.
at oracle.sysman.assistants.common.dbutil.sqlplus.SQLPlusEngine.setDefaultEngineSettings(SQLPlusEngine.java:2144)
at oracle.sysman.assistants.common.dbutil.sqlplus.SQLPlusEngine.initialize(SQLPlusEngine.java:352)
at oracle.sysman.assistants.rcu.backend.action.SQLPlusAction.perform(SQLPlusAction.java:211)
at oracle.sysman.assistants.rcu.backend.task.AbstractCompTask.execute(AbstractCompTask.java:245)
at oracle.sysman.assistants.rcu.backend.task.ActualTask.run(TaskRunner.java:306)
at java.lang.Thread.run(Thread.java:662)

2013-05-04 14:34:55.546 ERROR rcu: oracle.sysman.assistants.rcu.backend.task.ActualTask::run: RCU Operation Failed
oracle.sysman.assistants.common.task.TaskExecutionException: RCU-6136:Error while trying to execute SQLPlus action.
at oracle.sysman.assistants.rcu.backend.task.AbstractCompTask.execute(AbstractCompTask.java:302)
at oracle.sysman.assistants.rcu.backend.task.ActualTask.run(TaskRunner.java:306)
at java.lang.Thread.run(Thread.java:662)
Caused by: oracle.sysman.assistants.common.task.ActionFailedException: RCU-6136:Error while trying to execute SQLPlus action.
at oracle.sysman.assistants.rcu.backend.action.SQLPlusAction.perform(SQLPlusAction.java:222)
at oracle.sysman.assistants.rcu.backend.task.AbstractCompTask.execute(AbstractCompTask.java:245)
... 2 more
Caused by: java.io.IOException: java.io.IOException: java.io.IOException: java.io.IOException: java.io.IOException: java.io.IOException: java.io.IOException: java.io.IOException: java.io.IOException: java.io.IOException: java.io.IOException: java.io.IOException: Error initializing sqlplus.
at oracle.sysman.assistants.common.dbutil.sqlplus.SQLPlusEngine.setDefaultEngineSettings(SQLPlusEngine.java:2144)
at oracle.sysman.assistants.common.dbutil.sqlplus.SQLPlusEngine.initialize(SQLPlusEngine.java:352)
at oracle.sysman.assistants.rcu.backend.action.SQLPlusAction.perform(SQLPlusAction.java:211)
... 3 more

Solution: 
I have no idea which of the following steps solved the issue:

1) Install DB Character Set : AL32UTF8

2) Insall Java and Set JDK/bin in Set Environment

3) For windows download msvcr71.dll and place it in windows/system32 or windows/syswow64

4) Disable Firewall until RCU configuration complete

5) Make sure that SQL Plus is working.

Thanks !!!