Preview throwing error HumanReadableSwiftError ConfigurationError: noPreviewInfos

Question

Created Sep ’20

Replies 12

Boosts 0

Views 7.6k

Participants 11

In my current project, previews barely work. Most of the time, the following error is displayed on top:

Cannot preview in this file -- Unexpected error occurred

Sometimes, refreshing works by clicking the Try Again button, but usually that takes multiple tries. When I click the Diagnostics button, the following error is shown:

Code Block HumanReadableSwiftError
ConfigurationError: noPreviewInfos(arch: "x86_64", sdkRoot: "/Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator14.2.sdk")

This happens both in Xcode 12 and the beta Xcode 12.2. Who has a solution for this?

Answered by bartvk in 657437022

The problem cropped up again, and I bit the bullet. In Xcode, I created a new project and copied all the source from the old to the new project. I recreated everything in the new project, meaning: set the bundle ID, version number, build number, launch screen et cetera.

That fixed it. So, it's not the source files themselves, it's something in the project file(s). I did a manual diff between the <projectname>.xcodeproj/project.pbxproj of the old and the new project, but I gave up after staring 15 minutes at the incredibly messy diff. Preview now work.

Boost

Answer 1

Erik_Dahlman OP

Oct ’20

Did you ever figure out a solution to this? SwiftUI previews have been tough to troubleshoot, and after some changes, this is the error I'm stuck on.

0

Answer 2

bartvk OP

Oct ’20

Once, I found that the project had multiple targets. And the file wasn't a member of the currently selected target. But that only happened once. Other times, I found that repeatedly clicking the preview button (or repeatedly pressing Option-Cmd-P) fixed it. But most of the time, the preview is simply not appearing.

Xcode 12.0 and 12.2 series are rough for me, right now.

2

Answer 3

bartvk OP

Oct ’20

After upgrading to Xcode 12.2 beta 3 (12B5035g), one failing preview offered an error: a unittest (i.e. an XCTestCase subclass) was not part of any target. Of course, it was part of the unittest target only. So I have no idea why the preview depended on that unittest file. I just deleted the file from Xcode, and for this project, the error "Failed to build ***.swift" keeps popping up above the preview but if I repeatedly hit Cmd-Shift-P, it does render.

Edit: never mind, other views no longer render. Very frustrating.

0

Answer 4

fernando_romiti OP

Dec ’20

I'm having this issue in Xcode 12.3 (12C33). Any ideas what is causing this issue? if you keep hitting try again sometimes randomly works once and then keep failing

0

Answer 5

bartvk OP

Jan ’21

Accepted Answer

The problem cropped up again, and I bit the bullet. In Xcode, I created a new project and copied all the source from the old to the new project. I recreated everything in the new project, meaning: set the bundle ID, version number, build number, launch screen et cetera.

That fixed it. So, it's not the source files themselves, it's something in the project file(s). I did a manual diff between the <projectname>.xcodeproj/project.pbxproj of the old and the new project, but I gave up after staring 15 minutes at the incredibly messy diff. Preview now work.

1

Answer 6

HaiFengKao OP

Jan ’21

I got the same problem. after I remove use_frameworks! :linkage => :static in my Podfile, the preview works again

0

Answer 7

Jumabek OP

Dec ’21

This help me "Product" => "Clean build folder"

1

Answer 8

2381723712361624123123 OP

Apr ’22

This error appeared when I ran preview whilst having an iOS 13 simulator selected. Switching to a simulator of iOS14+ resolved the issue for me.

5

Answer 9

CRaez_Dev OP

Mar ’24

In Xcode 15.3 I had the same error, and I solved it cleaning the Xcode storage

Settings > Storage > Developer

Clean the Xcode Project Build Files.

0

Answer 10

VancouverDoug OP

Apr ’24

Thanks, CRaez_Dev! That worked for me with XCode 15.3,

0

Answer 11

Mightypants OP

May ’24

In my situation, I connect my iPhone to the Mac and live preview on the real device.
When it comes to the same problem, the HumanReadableSwiftError, everything will be OK after rebooting the iPhone. If I change another iPhone to test, it works as well.

0

Answer 12

Mightypants OP

May ’24

In my situation, I connect my iPhone to the Mac and live preview on the real device. When it comes to the same problem, the HumanReadableSwiftError, everything will be OK after rebooting the iPhone. If I change another iPhone to test, it works as well.

0