Oracle® Database 11g / 12c / 18c error codes IMP-00068: Could not find environment national character set

IMP-00068: Could not find environment national character set

Oracle Error Code: IMP-00068

Cause: An environment national character set was specified that was not recognized by the Import utility.

Action: Ensure that the spelling of the national character set specified in the environment variable NLS_NCHAR is correct.