Try with unset the NLS_LANG Value or Try with some spelling Error
This issue was reported by our Test team.
But when I tried using the same oracle server on the same machine to install my application, I didn't get this error.
So I am trying to identify the scenario when this error can occur.
I tried unsetting NLS_LANG and restarted oracle service but still I donot see this error.
Also I tried some spell error.But in that case, I am not able to connect to oracle database and I see following error:
ORA-12705: Cannot access NLS data files or invalid environment specified.