use another port number:
the information provided for this listener is currently in use by other software
on this computer.you can proceed with the configuration as it is ,but it will not
be possible to start this listener until the conflict is resolved .would you like
to continue with the configuration anyway?
解决这个问题，注意查正/etc/hosts中IP地址是否填写正确。以及listener.ora中主机名是否正确