Application Loader Unable To Upload

I'm trying to use the Application Loader to upload a .pkg to the Mac App store. When launching from Xcode and attempting to upload, I get the following error:


No version found for 'adamId - platform' (1182510411-macOS App). If this problem persists for more than 24 hours, please contact your Apple representative.


I've read online that this happens in more recent verisons of the Application Loader, and that it shouldn't happen if I use version 3.0 (my current version is 3.7). I downloaded v3.0 and installed, but each time I open it, it still says v3.7. I've also tried uninstalling and reinstalling, but it's always v3.7. My guess is that it's built into my version of Xcode (v9.2) and that I'll need to downgrade that in order to get v3.0, but I would like to avoid that if possible. Is there a way to uninstall the loader completely so that I can reinstall the version I need? If not, which version of Xcode will I need to downgrade to in order to get v3.0 of Application Loader?


Any help is appreciated