[error 13079] [ecid: -] No matching CACHE element found in webcache.xml for current hostname

RunInstaller stuck in screen when I came back:
Configuration assistant "OPMN Configuration Assistant" failed.
Log: $ORACLE_HOME/opmn/logs/WebCache~WebCacheAdmin~1

Go to check log.
tail -10f   WebCache~WebCacheAdmin~1
[error 13079] [ecid: -] No matching CACHE element found in webcache.xml for current hostname (***) and ORACLE_HOME (***)

That "hostaname" is what I get when run command hostname. However, it is not mine ORACLE_HOSTNAME just before installation. Thing is clear,  Webcache picked up my specified hostname but it thinks it doesn’t match output from hostname command. Then I do next is to modify webcache.xml …Oracle approved this guess in metalink ID: 432774.1 .

"Edit the file $OMS_HOME/webcache/webcache.xml, changing the HOSTNAME attribute in the CACHE element
<CACHE NAME ………. HOSTNAME="***">

Keep on going.