How to create a new version using iTMSTransporter?

I am writing a script that uses the

iTMSTransporter

command-line application to create and upload iOS application metadata for the iOS App Store. However, it's failing in the most bizarre way with little of any helpful information.

Apple's web service operation was not successful Unable to authenticate the package: Benders.itmsp ERROR ITMS-4157: "Version '2.1.10' is not valid for update or doesn't exist" at Software/SoftwareMetadata (MZItmspSoftwareMetadataPackage)

Of course version 2.1.10 doesn't exist—that's exactly what I'm trying to do. Is there some kind of special flag that is needed to create new versions of an app at the command line? I've scoured the

-help

documentation in the tool itself, but can see no such argument.

I feel like I've just run into a brick wall. Googling has turned up nothing.