NCLOB Unicode Field - Please help!

Question

I'm trying to use the NCLOB data type to store some Unicode characters (Cyrillic but also other UTF-8 chars). I have created an NCLOB field (similar to MS Access' memo field). I need to get LONG text into the NCLOB.
When I try to copy from a LONG field to NCLOB, I get the error below. When I try to do an UPDATE statement and use TO_LOB(mylongfield), I get the same error:
ORA-00932: inconsistent datatypes
I'm using Oracle 8.1.7.2.0 on Unix. Here are my nls_database_parameters:
NLS_LANGUAGE: AMERICAN
NLS_TERRITORY: AMERICA
NLS_CURRENCY: $
NLS_ISO_CURRENCY: AMERICA
NLS_NUMERIC_CHARACTERS: .,
NLS_CHARACTERSET: CL8MSWIN1251
NLS_CALENDAR: GREGORIAN
NLS_DATE_FORMAT: DD-MON-RR
NLS_DATE_LANGUAGE: AMERICAN
NLS_SORT: BINARY
NLS_TIME_FORMAT: HH.MI.SSXFF AM
NLS_TIMESTAMP_FORMAT: DD-MON-RR HH.MI.SSXFF AM
NLS_TIME_TZ_FORMAT: HH.MI.SSXFF AM TZH:TZM
NLS_TIMESTAMP_TZ_FORMAT: DD-MON-RR HH.MI.SSXFF AM TZH:TZM
NLS_DUAL_CURRENCY: $
NLS_COMP: BINARY
NLS_NCHAR_CHARACTERSET: UTF8
NLS_RDBMS_VERSION: 8.1.7.2.0
Here are the queries I tried:
UPDATE mydb.mytablename
SET nclobfield = longtextfield
WHERE...
UPDATE mydb.mytablename
SET nclobfield = TO_LOB(longtextfield)
WHERE...
TIA

Answer 1

NCLOB columns can not be used for this purpose in Oracle8i. When they were first introduced in Oracle8i the National Character set was meant to support a couple of fixed with Asian character sets. While the National character set in Oracle8i can be set to other character sets they are unsupported. In Oracle9i and on the National Character set is exclusively unicode and can be used for storing Cyrillic characters.