ORA-12705 export NLS_LANG

Database version: 10.2.0.4 EE
OS: AIX 6.1
I want to set the NLS_LANG parameter at OS level to run the import of the database. I'm receiving the below error when I run sqlplus or impdp.
ORA-12705: Cannot access NLS data files or invalid environment specified
The NLS parameters at DB level are below. Could someone let me know how to set the parameter.
I tried in multiple ways like below. But, no success.
$export NLS_LANG=.UTF8
$export NLS_LANG=AMERICAN_AMERICA.UTF8
SQL> SELECT * from v$nls_parameters;
PARAMETER                                                        VALUE
NLS_LANGUAGE                                                     AMERICAN
NLS_TERRITORY                                                    AMERICA
NLS_CURRENCY                                                     $
NLS_ISO_CURRENCY                                                 AMERICA
NLS_NUMERIC_CHARACTERS                                           .,
NLS_CALENDAR                                                     GREGORIAN
NLS_DATE_FORMAT                                                  DD-MON-RR
NLS_DATE_LANGUAGE                                                AMERICAN
NLS_CHARACTERSET                                                 UTF8
NLS_SORT                                                         BINARY
NLS_TIME_FORMAT                                                  HH.MI.SSXFF AM
PARAMETER                                                        VALUE
NLS_TIMESTAMP_FORMAT                                             DD-MON-RR HH.MI.SSXFF AM
NLS_TIME_TZ_FORMAT                                               HH.MI.SSXFF AM TZR
NLS_TIMESTAMP_TZ_FORMAT                                          DD-MON-RR HH.MI.SSXFF AM TZR
NLS_DUAL_CURRENCY                                                $
NLS_NCHAR_CHARACTERSET                                           AL16UTF16
NLS_COMP                                                         BINARY
NLS_LENGTH_SEMANTICS                                             BYTE
NLS_NCHAR_CONV_EXCP                                              FALSE

Hi,
Please check in your given thread.
exp / owner=test file=test.dmp
Export: Release 9.2.0.6.0 - Production on Wed Jun 17 10:06:42 2009
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Connected to: Oracle9i Enterprise Edition Release 9.2.0.6.0 - 64bit Production
JServer Release 9.2.0.6.0 - Production
Export done in US7ASCII character set and AL16UTF16 NCHAR character set
server uses WE8ISO8859P15 character set (possible charset conversion)
You will see the highlighted warning in exp/imp if NLS_LANG is not set correctly and it could cause charset conversion.
Regards
Edited by: skvaish1 on Feb 17, 2010 3:00 PM

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ORA-12705 Invalid or unknown NLS_LANG parameter value specified

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b: http://sozaman.blogspot.com

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Hello
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I already google it but I am not confident about my result
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~linh
null

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