Cannot run Preview in Xcode 13 RC

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I can't run SwiftUI Previews in Xcode since some betas and only in one project.

I keep getting the error

Command CompileSwiftSources failed with a nonzero exit code

I can normally install the app on my phone and also run it in the simulator but not the preview for SwiftUI.

I don't know what's wrong and also this error message is not really helping.

Do you know a way to get a better error message to see what's causing the error?

I'm currently running Xcode 13 RC but it also happened with Beta 4 and 5

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