Error uploading or updating data using the DATALOAD, FASTLOAD or DATAUPDATE command on a database instance that is using UNICODE.
If data is uploaded into columns of a character-based data type (CHAR), Loader converts it into a format that the database recognizes (UCS-2). In this case, an error has occurred during the conversion. The data that is to be uploaded contains characters that cannot be converted to UCS-2.
Correct the rejected data and re-execute the command.