Command Line Build Problem

Hi, I'm having difficulty using the command line build. I keep getting an error:

[ERROR] Invalid selected Titanium SDK "3.4.1.GA,true"

My TiApp.xml has the version set

<sdk-version>3.4.1.GA</sdk-version>

My command line script looks like:

ti build --platform ios --target dist-appstore --pp-uuid [my provisioning id] -—distribution-name [my distribution name]

I've tried putting --sdk 3.4.1.GA in the command line as well but to no avail.