Check Target Membership of .intentdefinition file in your Widget Extension.
TomoyaOnishi
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clean build, clean derived, restart Xcode/Mac, reinstall Xcode, downgrade to 12.2 doesn't help. I'm running Xcode in Downloads directory, not Application Folder. It may be related to problem. try it.
I downgraded to Xcode 12.2. It works for me.
https://developer.apple.com/download/more/?=xcode
I have a same issue.
Log.txt
Encountered an error communicating with IBAgent-iOS. (Failure reason: IBAgent-iOS (-1) failed to launch): Failed to launch IBAgent-iOS via CoreSimulator spawn (Failure reason: Failed to spawn IBAgent-iOS on iPhone Xʀ (F2312C83-F9CB-4D88-887A-D8CDBA090B46, iOS 14.3, Booted)): Invalid device state