Some Macs recently received a macOS system update which disabled the simulator runtimes used by Xcode 15, including the simulators for iOS, tvOS, watchOS, and visionOS. If your Mac received this update, you will receive the following error message and will be unable to use the simulator: The com.apple.CoreSimulator.SimRuntime.iOS-17-2 simulator runtime is not available. Domain: com.apple.CoreSimulator.SimError Code: 401 Failure Reason: runtime profile not found using "System" match policy Recovery Suggestion: Download the com.apple.CoreSimulator.SimRuntime.iOS-17-2 simulator runtime from the Xcode To resume using the simulator, please reboot your Mac. After rebooting, check Xcode Preferences → Platforms to ensure that the simulator runtime you would like to use is still installed. If it is missing, use the Get button to download it again. The Xcode 15.3 Release Notes are also updated with this information.

We have a simple workflow that just runs the Test action on my unit_tests scheme (see Xcode Cloud workflow configuration screenshot). The workflow is configured to use Xcode 16.4 (Latest Release), macOS Sequoia 15.6 (Latest Release), and iOS 18.0 simulators. Today, this workflow has been consistently running indefinitely. The Xcode cloud runner tries to launch the simulator to execute the tests, but it fails. See the error message in the screenshot from Xcode Cloud logs. Link to corresponding build is in my Feedback Assistant ticket. It continues to retry this operation for a very long time — I had one job that ran for over 90 minutes. Link to corresponding build also in that same Feedback Assistant ticket. Are Xcode Cloud runners perhaps currently undergoing maintenance? Or is something else going on. I would appreciate if Xcode Cloud usage from today could be refunded to my team’s account. Feedback Assistant ticket #FB20195292. Error message: MyApp encountered an error (Failed to prepare device 'iPhone 16' for impending launch. (Underlying Error: Unable to boot the Simulator. launchd failed to respond. (Underlying Error: Failed to start launchd_sim: could not bind to session, launchd_sim may have crashed or quit responding)))

Hello Apple Developer Community, I'm experiencing an issue with file download functionality in the iOS Simulator after updating to Xcode 26 RC (Build 17A321). Issue Description: When attempting to download files in the iOS Simulator via Safari, the download prompt appears correctly, but after tapping the 'Download' button, files are not being saved to the Files app. The download appears to do nothing with no error message, no indication of failure, but the file simply doesn't appear in Downloads or anywhere in the Files app. Environment: Xcode Version: 26.0 RC (17A321) iOS Simulator Version: 26.0 RC (23A339) Device Simulated: iPhone Air Steps to Reproduce: Open Safari in the iOS Simulator Navigate to a downloadable file (PDF, ZIP, etc.) Tap to initiate download Download prompt appears as expected Tap the 'Download' button Check the Files app → Downloads folder (empty) Expected Behavior: Files should download normally as they do on physical devices and as they did in previous Xcode versions. Actual Behavior: The download prompt dismisses after tapping 'Download', but no file appears in the Files app. No error message is shown, and there's no indication that the download failed, it simply appears as if nothing happened. Additional Information: Downloads work correctly on physical device (iOS 26 RC 23A340) This functionality worked properly in previous Xcode versions I have created a bug report to Feedback assistant: FB20190927 Thanks in advance for any assistance.

Hi There We are looking to download the iOS 18.4 Simulator Runtime but due to restrictions on internet access in our company we are unable to use XCode to download the required file. Is there an alternative location we can browse to and download the iOS 18.4 Simulator Runtime file? We checked the downloads sections of the Apple Developer site but can only find 18.2 version of the iOS Simulator Runtime. Thanks

Around 8/23/25, I installed macOS 15.6.1 on my work Mac. After this I can no longer log the application I am working on into our backend servers. My work Mac is running Palo Alto Global Protect VPN software along with a bunch of associated security software to lock down my computer. I had no issues with connecting to our backend servers behind the firewall before the macOS update and nothing has changed in the source code related to this. When I send the username the network call just hangs and never times out. On the other hand, if I turn off the VPN and point to the production environment the call succeeds with no problems. Any Ideas?

When trying to login with sandbox account in my simulator, nothing happens, it just become inactive for few seconds and then it become active again prompting that I can login, again and again.

I'm trying to sign-in with a Sandbox account with my iOS simulator. Using Xcode 26 beta 7. After I sign in, the button goes inactive for a few seconds but then nothing happens. It does not actually sign me in.

hello, I have an app with In-App purchase set up, it works fine in TestFlight on an iOS device but the download from the App Store gives me a transaction failed message. I tried to replicate in the simulator but from what I've read is that you can't do in-app purchase testing in the simulator. Perhaps I'm wrong here but I've tried multiple sandbox accounts, etc.. and still get an unusual "...password can't be reused..." error (pasted below) in the debug description. I'm curious if anyone else has dealt with this scenario and if so how did you go about researching/identifying the issue and/or resolving it. Partial error message: <SKPaymentQueue: 0x60000000e370>: Payment completed with error: Error Domain=ASDErrorDomain Code=530 "(null)" UserInfo={NSUnderlyingError=0x600000c74750 {Error Domain=AMSErrorDomain Code=100 "Authentication Failed The authentication failed." UserInfo={NSMultipleUnderlyingErrorsKey=( "Error Domain=AMSErrorDomain Code=2 "Password reuse not available for account The account state does not support password reuse." UserInfo={NSDebugDescription=Password reuse not available for account The account state does not support password reuse., AMSDescription=Password reuse not available for account, AMSFailureReason=The account state does not support password reuse.}"

Hello there! I’m currently stuck with Xcode 26.0 beta 6 (17A5305f), as I can’t download the latest SDK/Simulator for iOS 26.0 beta 6 (23A5324a). The download constantly fails for days now with the following error message: (-67061 invalid signature (code or signature have been modified) Domain: SimDiskImageErrorDomain Code: 5 User Info: { DVTErrorCreationDateKey = "2025-08-26 21:11:30 +0000"; unusableErrorDetail = ""; } -- (-67061 invalid signature (code or signature have been modified) Domain: SimDiskImageErrorDomain Code: 5 User Info: { unusableErrorDetail = ""; } -- System Information macOS Version 15.6.1 (Build 24G90) Xcode 26.0 (24208.7) (Build 17A5305f) Timestamp: 2025-08-26T23:11:30+02:00 I’ve already tried re-downloading the Xcode beta 6 from the Apple Developer site. I’ve also tried restarting my Mac and even tried to use the command line to install iOS 26 beta SDK via xcodebuild -downloadPlatform iOS -exportPath ~/Downloads (as noted here). This lead to the same error message. Can someone help? I’m unable to develop my apps right now! 🫠 I’ve also filed a feedback: FB19915834

Hello, It seems Xcode 26 beta is lagging the OS releases, which is fine. However, how does one install a Beta N + 1 or N + 2 SDK into the older Xcode beta? I'd like to use iOS 26 Beta 8 from the Xcode 26 Beta 6 install I have. I have tried Settings/Components and Devices & Simulators but nothing Beta 7 nor 8 shows up there. Thanks! -- Greg Bolsinga

If I long press on an element, the sidebar disappears and then a Done appears on the screen, but nothing else changes, so what are the Environments in Vision Pro's Simulator?

Hello everyone, I am currently developing an iMessage Sticker Pack in Xcode 16.4 (Build 16F6) on macOS 15.6.1. The project builds without errors, but when running in the iOS 18.6 Simulator (iPhone 15 Pro, iPhone 16, etc.), the Sticker Pack does not show up inside Messages. Instead, the Simulator displays a white screen or the sticker drawer simply does not include my extension. In the logs I consistently see this error: FrontBoard[app] error: Application "de.eazyapp.smileystickerpack.StickerPackExtension" is unknown to FrontBoard Simulator device failed to launch de.eazyapp.smileystickerpack. Domain: FBSOpenApplicationServiceErrorDomain Code: 1 Failure Reason: The request was denied by service delegate (SBMainWorkspace) for reason: NotFound ("Application "de.eazyapp.smileystickerpack" is unknown to FrontBoard"). User Info: { BSErrorCodeDescription = RequestDenied; DVTErrorCreationDateKey = "2025-08-21 10:11:22 +0000"; FBSOpenApplicationRequestID = 0x6e63; IDERunOperationFailingWorker = IDELaunchiPhoneSimulatorLauncher; SimCallingSelector = "launchApplicationWithID:options:pid:error:"; } The request to open "de.eazyapp.smileystickerpack" failed. Domain: FBSOpenApplicationServiceErrorDomain Code: 1 Failure Reason: The request was denied by service delegate (SBMainWorkspace) for reason: NotFound ("Application "de.eazyapp.smileystickerpack" is unknown to FrontBoard"). User Info: { BSErrorCodeDescription = RequestDenied; FBSOpenApplicationRequestID = 0x6e63; } The operation couldn’t be completed. Application "de.eazyapp.smileystickerpack" is unknown to FrontBoard. Domain: FBSOpenApplicationErrorDomain Code: 4 Failure Reason: Application "de.eazyapp.smileystickerpack" is unknown to FrontBoard. User Info: { BSErrorCodeDescription = NotFound; } Event Metadata: com.apple.dt.IDERunOperationWorkerFinished : { "device_identifier" = "A3986FB9-55ED-42CC-9336-F695C4CB9451"; "device_model" = "iPhone17,1"; "device_osBuild" = "18.6 (22G86)"; "device_platform" = "com.apple.platform.iphonesimulator"; "device_thinningType" = "iPhone17,1"; "dvt_coredevice_version" = "443.24"; "dvt_coresimulator_version" = "1010.15"; "dvt_mobiledevice_version" = "1784.140.4"; "launchSession_schemeCommand" = Run; "launchSession_state" = 1; "launchSession_targetArch" = arm64; "operation_duration_ms" = 23478; "operation_errorCode" = 1; "operation_errorDomain" = FBSOpenApplicationServiceErrorDomain; "operation_errorWorker" = IDELaunchiPhoneSimulatorLauncher; "operation_name" = IDERunOperationWorkerGroup; "param_debugger_attachToExtensions" = 0; "param_debugger_attachToXPC" = 1; "param_debugger_type" = 3; "param_destination_isProxy" = 0; "param_destination_platform" = "com.apple.platform.iphonesimulator"; "param_diag_113575882_enable" = 0; "param_diag_MainThreadChecker_stopOnIssue" = 0; "param_diag_MallocStackLogging_enableDuringAttach" = 0; "param_diag_MallocStackLogging_enableForXPC" = 1; "param_diag_allowLocationSimulation" = 1; "param_diag_checker_tpc_enable" = 1; "param_diag_gpu_frameCapture_enable" = 0; "param_diag_gpu_shaderValidation_enable" = 0; "param_diag_gpu_validation_enable" = 0; "param_diag_guardMalloc_enable" = 0; "param_diag_memoryGraphOnResourceException" = 0; "param_diag_mtc_enable" = 1; "param_diag_queueDebugging_enable" = 1; "param_diag_runtimeProfile_generate" = 0; "param_diag_sanitizer_asan_enable" = 0; "param_diag_sanitizer_tsan_enable" = 0; "param_diag_sanitizer_tsan_stopOnIssue" = 0; "param_diag_sanitizer_ubsan_enable" = 0; "param_diag_sanitizer_ubsan_stopOnIssue" = 0; "param_diag_showNonLocalizedStrings" = 0; "param_diag_viewDebugging_enabled" = 1; "param_diag_viewDebugging_insertDylibOnLaunch" = 1; "param_install_style" = 2; "param_launcher_UID" = 2; "param_launcher_allowDeviceSensorReplayData" = 0; "param_launcher_kind" = 0; "param_launcher_style" = 0; "param_launcher_substyle" = 0; "param_runnable_appExtensionHostRunMode" = 0; "param_runnable_productType" = "com.apple.product-type.application.messages"; "param_structuredConsoleMode" = 1; "param_testing_launchedForTesting" = 0; "param_testing_suppressSimulatorApp" = 0; "param_testing_usingCLI" = 0; "sdk_canonicalName" = "iphonesimulator18.5"; "sdk_osVersion" = "18.5"; "sdk_variant" = iphonesimulator; } System Information macOS Version 15.6.1 (Build 24G90) Xcode 16.4 (23792) (Build 16F6) Timestamp: 2025-08-21T12:11:22+02:00 Steps I already tried: Verified Bundle Identifiers (App + Extension) Confirmed Stickers.xcstickers is only in the Extension target, not the App target Checked that the Extension is properly listed under Embed Foundation Extensions Performed Clean Build Folder, Simulator reset, and reinstall Tried on a fresh Mac with clean Xcode install Reproduced consistently across multiple iOS 18 Simulators Steps to reproduce Create new iMessage Sticker Pack App in Xcode Add PNG/APNG stickers into Stickers.xcstickers Run on Simulator (iOS 18.6) Open Messages → App Drawer Sticker Pack is missing, extension does not load Environment Xcode 16.4 (16F6) macOS 15.6.1 (24G90) iOS Simulator 18.6 Project type: iMessage Sticker Pack Question Has anyone else experienced this issue with iMessage Sticker Packs on iOS 18 Simulators? Any guidance would be appreciated Thank you, Hakan

I want to open the control center in Vision Pro’s Xcode simulator. Can I open it? If I can, please tell me how to do it. Thank you.

Hi, I’m trying to free up space on my computer and have uninstalled Xcode. However, I noticed that many large files remain on the filesystem even after uninstalling it. The largest remaining files (~33 GB) are iOS Simulator images located at: /System/Volumes/Data/Library/Developer/CoreSimulator/Volumes I attempted to delete them using root privileges, but it seems that these system files are mounted as read-only. I’m reaching out to ask for guidance to ensure that these files do not contain anything important for macOS, and that it’s safe to remove them before getting in recovery mode. Thank you very much for your advice!

Hello. I was working on a Unity game for iPhone, but Apple said that it is impossible to prohibit downloading to iPad. They tested it on iPad Air 5, and for some reason the game did not work correctly - nothing happened when launched, although everything was fine in the iPad Air 5 simulator and in the real iPhone. Please tell me what to do?

When I try to install the iOS 26.0 Universal Simulator component with Xcode-beta 5 I get the following error: Download failed. Domain: DVTDownloadableErrorDomain Code: 41 User Info: { DVTErrorCreationDateKey = "2025-08-11 14:39:06 +0000"; } -- Download failed. Domain: DVTDownloadableErrorDomain Code: 41 -- System Information macOS Version 15.6 (Build 24G84) Xcode 26.0 (24198.5) (Build 17A5295f) Timestamp: 2025-08-11T17:39:06+03:00

Hello. I was working on a Unity game for iPhone, but Apple said that it is impossible to prohibit downloading to iPad. They tested it on iPad Air 5, and for some reason the game did not work correctly - nothing happened when launched, although everything was fine in the simulator and in the real iPhone. Please tell me what to do?

I'm just getting started with swift development using Xcode 164 on a MacBook Pro running Sequoia 15.6. When I try to run the simplest "Hello World" app against iPhone simulators, I get the error messages below. I've looked at that location and none of the directory structure /private/var/db/eligibilityd below the 2224B135-8383-4C69-B339-B6DF9D88F6FD folder exists. Just wondering if I have a config error somewhere or if there's somewhere else I should be looking to correct this. It doesn't occur when I run on a physical iPhone device. Error message: load_eligibility_plist: Failed to open /Users/****/Library/Developer/CoreSimulator/Devices/DB1919F3-ECB8-4C55-817C-85B68F083F57/data/Containers/Data/Application/2224B135-8383-4C69-B339-B6DF9D88F6FD/private/var/db/eligibilityd/eligibility.plist: No such file or directory(2) Failed to send CA Event for app launch measurements for ca_event_type: 0 event_name: com.apple.app_launch_measurement.FirstFramePresentationMetric Failed to send CA Event for app launch measurements for ca_event_type: 1 event_name: com.apple.app_launch_measurement.ExtendedLaunchMetrics

Hello, I'm checking to see if anyone else is experiencing an issue downloading the latest beta simulator. When I try to download the iOS 26 beta 5 simulator in Xcode, the download fails instantly. There is no progress, just an immediate error with no message other than the code itself: DVTDownloadableErrorDomain Code: 41. I've already restarted both Xcode and the Mac multiple times. I have also tried downloading on different networks to rule out a firewall issue.

Xcode 26 Beta 5 Universal: Not able to install iOS 26 Beta 5 simulator on intel macs Below log is shown: Download failed. Domain: DVTDownloadableErrorDomain Code: 41 User Info: { DVTErrorCreationDateKey = "2025-08-08 06:37:48 +0000"; } Download failed. Domain: DVTDownloadableErrorDomain Code: 41 System Information macOS Version 15.5 (Build 24F74) Xcode 26.0 (24198.5) (Build 17A5295f) Is simulator run time for Xcode 26 Beta 5 not given out yet? However I am able to download simulators on Apple Silicon macs with same Universal installer. Has anyone faced similar issue?

My Xcode version is 16.4, I have added an old version simulator (iPhone 13 with iOS 17.2) to the simulator list, but I can't use it for debugging, and all on display are iPhone 16 with 18.6 (the latest iOS devices). The setting "Minimum Deployments" for my App is 16.6. In addition, when I downloaded an iOS 16.0 version simulator, Xcode automatically added all iPhone 15 models of the simulator, but I still can't use them. In short, I can only use the default iPhone 16 simulators. So, if I want to debug my App using iPhone 13 (iOS 17.2), what should I do? Thank you for your reply. :) Another small issue, my App's destination has been set to support only iPhone, why are those iPad simulators still appearing?