Oracle11g ORA-12516:TNS:侦听器找不到具有匹配协议堆栈的可用处理程序

在运行emca时，我一直收到这些错误，如下所示：

Dec 3, 2012 5:25:29 PM oracle.sysman.emcp.EMConfig perform
INFO: This operation is being logged at C:\Oracle\11g\cfgtoollogs\emca\DB01\emca_2012_12_03_17_24_36.log.
Dec 3, 2012 5:25:29 PM oracle.sysman.emcp.ParamsManager checkListenerStatusForDBControl
WARNING: ORA-12516: TNS:listener could not find available handler with matching protocol stack

Dec 3, 2012 5:25:29 PM oracle.sysman.emcp.EMConfig perform
SEVERE:

Database connection through listener failed.  Fix the error and run EM Configuration Assistant again.

Some of the possible reasons may be:

1) Listener port 1521 provided is incorrect.  Provide the correct port.
2) Listener is not up.  Start the Listener.
3) Database service DB01.world is not registered with listener.  Register the database service.
4) Listener is up on physical host and ORACLE_HOSTNAME environment variable is set to virtual host.  Unset ORACLE_HOSTNAME environment variable.
5) Listener is up on virtual host.  Set environment variable ORACLE_HOSTNAME=(virtual host).
6) /etc/hosts/ does not have correct entry for hostname.

Refer to the log file at C:\Oracle\11g\cfgtoollogs\emca\DB01\emca_2012_12_03_17_24_36.log for more details.
Could not complete the configuration.  Refer to the log file at C:\Oracle\11g\cfgtoollogs\emca\DB01\emca_2012_12_03_17_24_36.log for more details.

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