SwiftUI preview bug: FailedToLaunchAppError: Failed to launch

Question

popipo OP

Created Oct ’23

Replies 1

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Participants 2

== DATE:

Thursday, October 26, 2023 at 13:06:58 China Standard Time

2023-10-26T05:06:58Z

== PREVIEW UPDATE ERROR:

FailedToLaunchAppError: Failed to launch com.***

==================================

|  MessageError: Unexpected message object
|  
|  Unexpected message object: expected ProcessID, got Optional(6872)

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Answer 1

Developer Tools Engineer OP

Apple

Oct ’23

Hi,

Sorry to hear you are having problems getting previews working. The best next step will be to file a feedback with diagnostics so we can take a look.

Steps to generate helpful diagnostics:

Download and install the logging profile on all devices involved. Instructions and profiles are available here: https://developer.apple.com/bug-reporting/profiles-and-logs/?name=swift
Reproduce the issue
Click the "Diagnostics" button in the error banner in Previews' Canvas area (or if the banner is missing you can use the menu: Editor > Canvas > Diagnostics)
In the sheet that appears, click "Generate Report" in the bottom left of the sheet
Attach (or make from the folder) the resulting zip file to the bug (will be named something like previews-diagnostics-0123456789.zip)
Generate the sysdiagnose(s) and attach those too

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