Canvas Preview error: Could not find target description

Hi, I'm developing an iOS/WatchOS app and have an issue with Preview for WatchOS components. The error message is

Could not find target description for “ContentView.swift”

Preview for all other views in the iOS app work fine. Also, the app builds and runs fine on the watch simulator and a physical watch. Preview worked fine earlier today and I didn't exclude it in EXCLUDED_SOURCE_FILE_NAMES.

Does anyone have an idea what causes this issue?

Canvas Preview error: Could not find target description
 
 
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