Message Oracle ORA-29892 - indextypes with array DML do not support the given data type

ERRORindextypes with array DML do not support the given data type
CAUSEThe user specified a REF or a LONG datatype which is not supported in CREATE/ALTER INDEXTYPE WITH ARRAY DML (DATA_TYPE, VARRAY_TYPE).
ACTIONReissue the CREATE/ALTER INDEXTYPE statement without the REF or LONG datatype.