Xcode Preview Error

Question

alex_fh OP

Created Apr ’24

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Hi All,

I have been using Xcode for less than 5 months. Recently I get a problem that my previews does not load, even when I created a new project on a local disk.

The Project builds, but the preview does not.

The error I saw from the Diagnostics window is as below

== PREVIEW UPDATE ERROR:
    HumanReadableSwiftError
    CancellationError: CancellationError()

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Answer 1

Developer Tools Engineer OP

Apple

Apr ’24

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 report (will be named something like previews-diagnostics-0123456789.zip)
Generate the sysdiagnose(s) and attach those too

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