In the Metrics section, you can use the first drop-down to be "active devices" and then in the other dropdown you can choose "app version"

It also appears to be happening only when using Swift 5.3, Swift 5.2 compiles it fine. For reference I am trying both in Xcode 12.0.1.

Did you manage to solve this? I am experiencing the same issue

I am having this issue too. I have narrowed it down to the colon (which is prohibited in build files). Looks to be related to the local file reference to the SwiftPackage although I wouldn't expect that you have to remove it before archiving.