R12.2 Running adop prepare Encountering Error While Executing autoconfig On All Other Nodes

During the Upgrade process to E-Business Suite Release 12.2 Patch has been applied on the admin node.
The web nodes have not yet been configured so it is essentially a single node instance at this point.
Running adop=prepare encountering [ERROR] while executing on all other nodes :
AutoConfig completed successfully.
  [STATEMENT] [END 2013/09/13 17:08:46] Running AutoConfig
  [STATEMENT] Executing action in all nodes
Exception in thread "main" java.lang.NullPointerException
  at oracle.apps.ad.util.RemoteProcessExecutor.main(RemoteProcessExecutor.java:781)
  [ERROR] Error: While executing on all other nodes.
  [ERROR] Error occurred while executing AC on other nodes.
  [ERROR] Error while runPendingConfigClone sub-routine is called
  [STATEMENT] [START 2013/09/13 17:09:07] Check and Stop Patch Admin Server
  [STATEMENT] [START 2013/09/13 17:09:18] Check and Stop Patch FS Admin Server
You are running adadminsrvctl.sh version 120.10.12020000.2
Stopping WLS Admin Server...
Refer $INST_TOP/logs/appl/admin/log/adadminsrvctl.txt for details
adadminsrvctl.sh: exiting with status 0
adadminsrvctl.sh: check the logfile $INST_TOP/logs/appl/ad min/log/adadminsrvctl.txt for more information ...
  [STATEMENT] [END 2013/09/13 17:09:36] Check and Stop Patch FS Admin Server
  [STATEMENT] [END 2013/09/13 17:09:42] Check and Stop Patch Admin Server
  [STATEMENT] Prepare phase completed with errors/warnings. Please check logfiles
  [STATEMENT] PREPARE Phase END TIME: 13-09-2013 17:09:58
  [STATEMENT] [START 2013/09/13 17:10:06] Unlocking sessions table
  [STATEMENT] [END 2013/09/13 17:10:10] Unlocking sessions table
  [STATEMENT] Log file: $APPL_TOP_NE/../log/adop/3/adop_20130913_162601.log
adop exiting with status = 1 (Fail)...
Cause
Incorrect setting in context file for
<shared_file_system oa_var="s_shared_file_system">true</shared_file_system>
Solution:
To fix the failure, implement following actions :
1) Modify the contextfile $INST_TOP/appl/admin/<SID>_<hostname>.xml :
set the <shared_file_system> to false :
<shared_file_system oa_var="s_shared_file_system">false </shared_file_system>
2) Execute Autoconfig
3) start the adop=prepare again and verify, if it is working now as expected.