Bumping: I am troubled by this exact issue, error code 1103. When making a configurable widget for a fresh multiplatform app, I can run it on the Mac just fine in widgetSimulator.
Though, when I add a new configurable widget target to my own (existing) multiplatform app, I get the 1103 error. Same boiler plate code. Since the two widgets have identical code, I'm having trouble identifying what part of my app stands in the way of this. Maybe it's that I used to use the old Siri Intents?
What's interesting to note is that adding a new static widget target (by unchecking the 'add configuration' checkbox), runs just fine also.
Mvanloon
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