-25340: UCS2 conversion error; character string contains invalid characters or character sequences 

Explanation:

The Loader command for importing or updating data into a database instance that uses UNICODE contains an error.

If data is imported 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 imported contains characters that cannot be converted to UCS-2.

User Response:

Correct the rejected data and re-execute the command.