AdminServer fails to start after upgrading WLS from 10.3.5.0.6 to 10.3.6 in OBIEE 11.1.1.6 environme

Hi, On 64 bit Linux, the command java -jar wls1036_upgrade_installer.jar was run and it completed. But, we are no longer able to startup the Admin Server: Running $DOMAIN_HOME/bin/startWebLogic.sh gives the following issue: Enter username to boot WebLogic server:weblogic Enter password to boot WebLogic server: <Feb 6, 2013 5:02:29 PM CST> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to STARTING> <Feb 6, 2013 5:02:29 PM CST> <Info> <WorkManager> <BEA-002900> <Initializing self-tuning thread pool> <Feb 6, 2013 5:02:29 PM CST> <Critical> <WorkManager> <BEA-002911> <WorkManager weblogic.kernel.System failed to schedule a request due to java.lang.NoSuchFieldError: pendingRequestCount java.lang.NoSuchFieldError: pendingRequestCount at weblogic.work.SelfTuningWorkManagerImpl.accepted(SelfTuningWorkManagerImpl.java:410)