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O2F-00324:

Unable to convert from the database character set to the compiler character set
Cause: The name of a type, attribute, or method cannot be converted from the client character set in effect when OTT was invoked to the compiler character set (typically ASCII or EBCDIC).
Action: A name is translated first from the database character set to the client character set, and then from the client character set to the compiler character set. The client character set is specified in a platform-dependent manner (On UNIX platforms, the client character set is specified by setting the NLS_LANG environment variable). Use a client character set that can be translated to the compiler character set. The compiler character set itself is one such character set. Specify synonyms in the INTYPE file for any names of database objects that cannot be successfully translated to the client character set.