Hi @Ed Prout, I have had the same error in some scala code. I came across this post when looking to solve the issue/problem. Site: http://deploymentzone.com/2015/12/20/s3a-on-spark-on-aws-ec2/ It states that if you see the error, then you need to bump down the "aws-java-sdk" to 1.7.4. `If you see a different exception message: <code>java.lang.NoSuchMethodError: com.amazonaws.services.s3.transfer.TransferManagerConfiguration.setMultipartUploadThreshold(I)V Then make sure you're using aws-java-sdk-1.7.4.jar and not a more recent version.` I bumped my jar down to 1.7.4, and the problem disappeared. I hope this helps. /Kasper ... View more