Oracle : Ошибка ORA-12705

"Cannot access NLS data files or invalid environment specified"
*Cause: Either an attempt was made to issue an ALTER SESSION command
with an invalid NLS parameter or value; or the environment
variable(s) NLS_LANG, ORA_NLSxx, or ORACLE_HOME was incorrectly
specified, therefore the NLS data files cannot be located.
*Action: Check the syntax of the ALTER SESSION command and the NLS
parameter, correct the syntax and retry the statement, or
specify the correct directory path/values in the environment

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