Hi!, Did you experienced failure of xcodebuild tool in Xcode 16? I can't build from command line. It fails when I am trying to perform clean, build, test, etc. actions. macOS version: 14.7 (23H124) Xcode 16.0, Build version 16A242d My steps: sudo xcode-select -s /Volumes/Apps/Developer/Xcode/Xcode_15_4_0.app xcodebuild -showBuildSettings -workspace mc.xcworkspace -scheme AllNormalTests_macOS As result showBuildSettings is working as expected when using Xcode 15.4. Command line invocation: /Volumes/Apps/Developer/Xcode/Xcode_15_4_0.app/Contents/Developer/usr/bin/xcodebuild -showBuildSettings -workspace mc.xcworkspace -scheme AllNormalTests_macOS User defaults from command line: IDEPackageSupportUseBuiltinSCM = YES Build settings for action build and target Testability_macOS: ACTION = build AD_HOC_CODE_SIGNING_ALLOWED = YES AGGREGATE_TRACKED_DOMAINS = YES ALLOW_TARGET_PLATFORM_SPECIALIZATION = NO ALTERNATE_GROUP = staff ... Then: sudo xcode-select -s /Volumes/Apps/Developer/Xcode/Xcode_16_0_0.app xcodebuild -showBuildSettings -workspace mc.xcworkspace -scheme AllNormalTests_macOS As result error: Command line invocation: /Volumes/Apps/Developer/Xcode/Xcode_16_0_0.app/Contents/Developer/usr/bin/xcodebuild -showBuildSettings -workspace mc.xcworkspace -scheme AllNormalTests_macOS User defaults from command line: IDEPackageSupportUseBuiltinSCM = YES ** INTERNAL ERROR: Uncaught exception ** Uncaught Exception: -[NSTaggedPointerString unsignedIntegerValue]: unrecognized selector sent to instance 0xbe036b67f7528701 Stack: 0 __exceptionPreprocess (in CoreFoundation) 1 objc_exception_throw (in libobjc.A.dylib) 2 -[NSObject(NSObject) __retain_OA] (in CoreFoundation) 3 ___forwarding___ (in CoreFoundation) 4 _CF_forwarding_prep_0 (in CoreFoundation) 5 -[DVTDeviceManager _startObservingDevice:] (in DVTFoundation) 6 -[DVTDeviceManager _adjustAvailableDevicesForChangeKind:addedObjects:removedObjects:] (in DVTFoundation) 7 __42-[_DVTDeviceLocatorTracker startObserving]_block_invoke (in DVTFoundation) 8 -[DVTObservingBlockToken observeValueForKeyPath:ofObject:change:context:] (in DVTFoundation) 9 NSKeyValueNotifyObserver (in Foundation) 10 NSKeyValueDidChange (in Foundation) 11 NSKeyValueDidChangeWithPerThreadPendingNotifications (in Foundation) 12 __62-[DVTiPhoneSimulatorLocator _startLocatingDevicesInDeviceSet:]_block_invoke_2 (in IDEiOSSupportCore) 13 __DVT_CALLING_CLIENT_BLOCK__ (in DVTFoundation) 14 ___DVTAsyncPerformBlockOnMainRunLoop_block_invoke (in DVTFoundation) 15 __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ (in CoreFoundation) 16 __CFRunLoopDoBlocks (in CoreFoundation) 17 __CFRunLoopRun (in CoreFoundation) 18 CFRunLoopRunSpecific (in CoreFoundation) 19 +[DVTKVOConditionValidator waitForCondition:sourceObject:keyPathAffectingConditionBlock:timeout:] (in DVTFoundation) 20 -[Xcode3CommandLineBuildTool _resolveInputOptionsWithTimingSection:] (in Xcode3Core) 21 -[Xcode3CommandLineBuildTool run] (in Xcode3Core) 22 XcodeBuildMain (in libxcodebuildLoader.dylib) 23 -[XcodebuildPreIDEHandler loadXcode3ProjectSupportAndRunXcode3CommandLineBuildToolWithArguments:] (in xcodebuild) 24 -[XcodebuildPreIDEHandler runWithArguments:] (in xcodebuild) 25 main (in xcodebuild) 26 start (in dyld) Abort trap: 6 Simple commands as shown below are working, but not typical build actions. xcodebuild -h xcodebuild -version xcodebuild -showsdks Thank you in advance!