oracle EM创建报错“No value was set for the parameter PORT”

今日创建oracle11gr2 RAC em报错，不知该如何解决，先记下，后面后时间再研究。
#emca -repos create -cluster
STARTED EMCA at Aug 11, 2012 8:28:20 PM
EM Configuration Assistant, Version 11.2.0.3.0 Production
Copyright (c) 2003, 2011, Oracle. All rights reserved.

Enter the following information:
Database unique name: ytdb
Service name: ytdb
Password for SYSMAN user:
Do you wish to continue? [yes(Y)/no(N)]: y
Aug 11, 2012 8:29:05 PM oracle.sysman.emcp.EMConfig perform
INFO: This operation is being logged at /oracle/app/oracle/cfgtoollogs/emca/ytdb/emca_2012_08_11_20_28_19.log.
Aug 11, 2012 8:29:10 PM oracle.sysman.emcp.EMConfig perform
SEVERE: No value was set for the parameter PORT.
Refer to the log file at /oracle/app/oracle/cfgtoollogs/emca/ytdb/emca_2012_08_11_20_28_19.log for more details.
Could not complete the configuration. Refer to the log file at /oracle/app/oracle/cfgtoollogs/emca/ytdb/emca_2012_08_11_20_28_19.log for more details.

日志：
CONFIG: sc141b not found in alive node cache
Aug 11, 2012 8:29:08 PM oracle.sysman.emcp.util.ClusterUtil areNodesAlive
CONFIG: Node: sc141a is accessible.
Aug 11, 2012 8:29:08 PM oracle.sysman.emcp.util.ClusterUtil areNodesAlive
CONFIG: Node: sc141b is accessible.
Aug 11, 2012 8:29:08 PM oracle.sysman.emcp.ParamsManager getInaccessibleNodeList
CONFIG: All nodes are up. Nodes: [sc141a, sc141b]
Aug 11, 2012 8:29:08 PM oracle.sysman.emcp.ParamsManager getInaccessibleSidList
CONFIG: All nodes are up. Nodes: [sc141a, sc141b] Sids: [ytdb1, ytdb2]
Aug 11, 2012 8:29:08 PM oracle.sysman.emcp.ParamsManager setParam
CONFIG: Setting param: NODE_LIST value: sc141a,sc141b
Aug 11, 2012 8:29:08 PM oracle.sysman.emcp.ParamsManager setParam
CONFIG: Setting param: SID_LIST value: ytdb1,ytdb2
Aug 11, 2012 8:29:10 PM oracle.sysman.emcp.util.ClusterUtil isShared
CONFIG: path: /oracle/app/oracle/product/11.2 isOracleHome: true isShared: false
Aug 11, 2012 8:29:10 PM oracle.sysman.emcp.util.ClusterUtil isShared
CONFIG: Path Cache contents: {/oracle/app/oracle/product/11.2=false}
Aug 11, 2012 8:29:10 PM oracle.sysman.emcp.util.ClusterUtil isShared
CONFIG: OH Cache contents: {/oracle/app/oracle/product/11.2=false}
Aug 11, 2012 8:29:10 PM oracle.sysman.emcp.ParamsManager getParam
CONFIG: No value was set for the parameter SRC_OH.
Aug 11, 2012 8:29:10 PM oracle.sysman.emcp.EMConfig restoreOuiLoc
CONFIG: Restoring oracle.installer.oui_loc to /oracle/app/oracle/product/11.2/oui
Aug 11, 2012 8:29:10 PM oracle.sysman.emcp.EMConfig restoreOuiLoc
CONFIG: Restoring oracle.installer.oui_loc to /oracle/app/oracle/product/11.2/oui
Aug 11, 2012 8:29:10 PM oracle.sysman.emcp.ParamsManager getParam
CONFIG: No value was set for the parameter PORT.
Aug 11, 2012 8:29:10 PM oracle.sysman.emcp.ParamsManager getParam
CONFIG: No value was set for the parameter PORT.
Aug 11, 2012 8:29:10 PM oracle.sysman.emcp.EMConfig perform
SEVERE: No value was set for the parameter PORT.
Refer to the log file at /oracle/app/oracle/cfgtoollogs/emca/ytdb/emca_2012_08_11_20_28_19.log for more details.
Aug 11, 2012 8:29:10 PM oracle.sysman.emcp.EMConfig perform
CONFIG: Stack Trace:
oracle.sysman.emcp.exception.EMConfigException: No value was set for the parameter PORT.
at oracle.sysman.emcp.ParamsManager.checkParam(ParamsManager.java:3446)
at oracle.sysman.emcp.EMDBPreConfig.checkReposParams(EMDBPreConfig.java:2568)
at oracle.sysman.emcp.EMDBPreConfig.checkParameters(EMDBPreConfig.java:1341)
at oracle.sysman.emcp.EMDBPreConfig.invoke(EMDBPreConfig.java:212)
at oracle.sysman.emcp.EMDBPreConfig.invoke(EMDBPreConfig.java:198)
at oracle.sysman.emcp.EMConfig.perform(EMConfig.java:250)
at oracle.sysman.emcp.EMConfigAssistant.invokeEMCA(EMConfigAssistant.java:599)
at oracle.sysman.emcp.EMConfigAssistant.performConfiguration(EMConfigAssistant.java:1482)
at oracle.sysman.emcp.EMConfigAssistant.statusMain(EMConfigAssistant.java:583)
at oracle.sysman.emcp.EMConfigAssistant.main(EMConfigAssistant.java:529)
Aug 11, 2012 8:29:10 PM oracle.sysman.emcp.EMConfig restoreOuiLoc
CONFIG: Restoring oracle.installer.oui_loc to /oracle/app/oracle/product/11.2/oui