Same error. Xcode Version 14.0 (14A309), Apple M1 iMac (24-inch, M1, 2021) with macOS 12.6 (21G115). Feedback FB11598250 filed, including code, screenshots, and diagnostics. Preview did work at one time, but now it's this: RemoteHumanReadableError: Failed to launch widget extension ================================== |  RemoteHumanReadableError |   |  NSError: Error Domain=CHSErrorDomain Code=1300 "(null)" ================================== |  MessageSendFailure: Message send failure for <ServiceMessage 151: relaunch>

You'll want to make sure you're using a port that supports an external display. On the m1 iMacs, for example, there are 4 USB-C ports, but only two are marked for display, and the other two do not work for an external monitor.