Weblogic server 11.1.1.8 PermGen space error

Hi,
I have installed the latest version 11.1.1.8 on windows 7   on machine cpu i7 3770  3,4ghz  with 16gb of RAM memory
the following kits:
Oracle 11g XE database  64bit (win64_11gR2_database)
ofm_rcu_win_11.1.1.8.0_64
ofm_wcc_generic_11.1.1.8.0
ofm_wc_generic_11.1.1.8.0
soa-jdev-extension

note that a base domain was configured

on starting weblogic server (10.3.6.0) i get the following error :
***************************************************************************
The WebLogic Server encountered a critical failure
Reason: PermGen space
***************************************************************************

i have followed what it says on some links:

https://forums.oracle.com/message/10321500
http://weblogic-wonders.com/weblogic/2010/12/30/different-out-of-memory-issues/

"For a WebLogic Server, you can change these settings in setDomainEnv.sh
Where you see