I was hoping to work through the WWDC session "Build an app with SwiftData", but as soon as I try to preview the first view, I'm getting this error when it tries to preview on "My Mac". (It previews correctly for ipad and iphone)

Cannot preview in this file
Failed to launch com.example.apple-samplecode.FlashCard

XCode 15.0 Beta 2, installed via "Xcodes" and set as active version.

I've downloaded this project from: https://developer.apple.com/documentation/SwiftUI/Building-a-document-based-app-using-SwiftData

And I'm directly loading the "Start" sample project (not the workspace, whatever that is.)

I'm running Ventura, so I created a Sonoma VM to test it on, but I get the same error. Any ideas?