adcfgclone.pl failed while performing clone of EBS 12.2 instance. This occurred while ohsT2PApply is in progress.

ERROR:

INST_TOP/admin/log/clone/run/ohsT2PApply/CLONE2016-02-02_13-10-02_599255196.error:
2015-12-02T3:10:04-06:00] [opmn] [ERROR:1] [] [internal]...
2015-12-02T13:10:04-06:00] [opmn] [ERROR:1] [] [internal] lxlinit - NLS boot file not found or invalid
opmnctl ping: error parsing /u01/tech_st/fs1/FMW_Home/webtier/instances/EBS_web_EBDEV_OHS1/config/OPMN/opmn/opmn.xml
[2015-12-02T3:10:04-06:00] [opmn] [ERROR:1] [105] [internal] XML parser init: character set initialization failed.
SEVERE : Dec 2, 2016 03:10:04 - ERROR - CLONE-20218   Cloning is not successful.
SEVERE : Dec 2, 2016 03:10:04 - CAUSE - CLONE-20218   An internal operation failed.
SEVERE : Dec 2, 2016 03:10:04 - ACTION - CLONE-20218   Provide the clone log and error file for investigation.

Solution:

Issue is because of existing environment variables. Before executing the adcfgclone verify any of the the environment is set. If already set please try to unset and run adcfgclone.

Else, Unset the following environment:
ORA_NLS10
TNS_ADMIN
ORACLE_HOME