Error uploading S3 Object with Server Side Encryption using Amazon KMS

I am getting the following exception when trying to reproduce the sample code Amazon provides for uploading S3 objects to be server side encrypted using Amazon KMS (key management service):

com.amazonaws.AmazonClientException: please use region-specific endpoint to access buckets located in regions that require V4 signing.
:: 
Caused by: com.amazonaws.services.s3.model.AmazonS3Exception: Requests specifying Server Side Encryption with AWS KMS managed keys require AWS Signature Version 4. (Service: Amazon S3; Status Code: 400; Error Code: InvalidArgument;

The code used is:

public void uploadServerSideEncryptedFileToS3( String bucketName , String key , String sourceFilePath , String masterKey ) {

    awsCredentials = new BasicAWSCredentials( awsAccessKey, awsSecretKey );
    PutObjectRequest putObjectRequest = new PutObjectRequest( bucketName,
                key , new File( sourceFilePath ) ).withSSEAwsKeyManagementParams( new SSEAwsKeyManagementParams( masterKey ) );

    ClientConfiguration clientConfiguration = new ClientConfiguration();
    clientConfiguration.setProtocol( Protocol.HTTPS );

    AmazonS3 connection = new AmazonS3Client( awsCredentials , clientConfiguration );
    connection.setRegion( com.amazonaws.regions.Region.getRegion( Regions.US_EAST_1 ) );
    PutObjectResult response = connection.putObject( putObjectRequest );
}