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The issue is present in XCode 11 GM seed 2. See below stack traceProcess: Xcode [15452]Path: /Users/USER/Downloads/Xcode-beta.app/Contents/MacOS/XcodeIdentifier: com.apple.dt.XcodeVersion: 11.2 (15519)Build Info: IDEFrameworks-15519000000000000~20 (11B44)Code Type: X86-64 (Native)Parent Process: ??? [1]Responsible: Xcode [15452]User ID: 501Date/Time: 2019-10-30 14:12:30.728 +0530OS Version: Mac OS X 10.15 (19A603)Report Version: 12Bridge OS Version: 4.0 (17P572)Anonymous UUID: 51B49748-1EE9-9601-05D7-15D35CBF7B9CSleep/Wake UUID: EC7E284A-1F3A-4636-ABB9-76A6CD43BBCFTime Awake Since Boot: 11000 secondsTime Since Wake: 960 secondsSystem Integrity Protection: enabledCrashed Thread: 0 Dispatch queue: com.apple.main-threadException Type: EXC_CRASH (SIGABRT)Exception Codes: 0x0000000000000000, 0x0000000000000000Exception Note: EXC_CORPSE_NOTIFYApplication Specific Information:ProductBuildVersion: 11B44UNCAUGHT EXCEPTION (NSInvalidArgumentException): -[IBUIColor colorUsingColorSpaceName:]: unrecognized selector sent to instance 0x7fc5ee02a440UserInfo: (null)Hints:Backtrace: 0 __exceptionPreprocess (in CoreFoundation) 1 DVTFailureHintExceptionPreprocessor (in DVTFoundation) 2 objc_exception_throw (in libobjc.A.dylib) 3 -[NSObject(NSObject) __retain_OA] (in CoreFoundation) 4 ___forwarding___ (in CoreFoundation) 5 _CF_forwarding_prep_0 (in CoreFoundation) 6 -[NSColorPickerPencilView(NSPencilCore) _pencilWithColor:] (in AppKit) 7 -[NSColorPickerPencilView setColor:] (in AppKit) 8 -[NSColorPanel _withColorSettingDisabled:] (in AppKit) 9 -[NSColorPanel _forceSetColor:] (in AppKit)10 -[NSColorPanel setColor:] (in AppKit)11 -[NSTextView updateFontPanel] (in AppKit)12 -[NSTextView(NSSharing) becomeFirstResponder] (in AppKit)13 -[IDEAttributedStringControlTextView becomeFirstResponder] (in IDEKit)14 -[NSWindow _realMakeFirstResponder:] (in AppKit)15 -[NSWindow(NSEventRouting) _handleMouseDownEvent:isDelayedEvent:] (in AppKit)16 -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] (in AppKit)17 -[NSWindow(NSEventRouting) sendEvent:] (in AppKit)18 -[IDEWorkspaceWindow sendEvent:] (in IDEKit)19 -[NSApplication(NSEvent) sendEvent:] (in AppKit)20 -[IDEApplication sendEvent:] (in IDEKit)21 -[NSApplication run] (in AppKit)22 NSApplicationMain (in AppKit)23 main (in Xcode)24 start (in libdyld.dylib)abort() calledApplication Specific Signatures:NSInvalidArgumentExceptionApplication Specific Backtrace 1:0 CoreFoundation 0x00007fff3a8ccd63 __exceptionPreprocess + 2501 DVTFoundation 0x000000010c7c3a29 DVTFailureHintExceptionPreprocessor + 2052 libobjc.A.dylib 0x00007fff707bbbd4 objc_exception_throw + 483 CoreFoundation 0x00007fff3a957206 -[NSObject(NSObject) __retain_OA] + 04 CoreFoundation 0x00007fff3a87351b ___forwarding___ + 14275 CoreFoundation 0x00007fff3a872ef8 _CF_forwarding_prep_0 + 1206 AppKit 0x00007fff37f45038 -[NSColorPickerPencilView(NSPencilCore) _pencilWithColor:] + 2977 AppKit 0x00007fff37f4419c -[NSColorPickerPencilView setColor:] + 278 AppKit 0x00007fff37f41bec -[NSColorPanel _withColorSettingDisabled:] + 379 AppKit 0x00007fff37f42088 -[NSColorPanel _forceSetColor:] + 10810 AppKit 0x00007fff37f41ea0 -[NSColorPanel setColor:] + 11911 AppKit 0x00007fff37a9f487 -[NSTextView updateFontPanel] + 194912 AppKit 0x00007fff37bfd73d -[NSTextView(NSSharing) becomeFirstResponder] + 27113 IDEKit 0x000000010e68bb91 -[IDEAttributedStringControlTextView becomeFirstResponder] + 4214 AppKit 0x00007fff37b6c00a -[NSWindow _realMakeFirstResponder:] + 41515 AppKit 0x00007fff37c4145d -[NSWindow(NSEventRouting) _handleMouseDownEvent:isDelayedEvent:] + 398316 AppKit 0x00007fff37b84e80 -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] + 261217 AppKit 0x00007fff37b8420d -[NSWindow(NSEventRouting) sendEvent:] + 34918 IDEKit 0x000000010e23f56b -[IDEWorkspaceWindow sendEvent:] + 15419 AppKit 0x00007fff37a47618 -[NSApplication(NSEvent) sendEvent:] + 35220 IDEKit 0x000000010e2856c7 -[IDEApplication sendEvent:] + 92221 AppKit 0x00007fff37a37005 -[NSApplication run] + 70722 AppKit 0x00007fff37a28e7d NSApplicationMain + 77723 Xcode 0x000000010c4e7e8d main + 54124 libdyld.dylib 0x00007fff71b1a405 start + 1Thread 0 Crashed:: Dispatch queue: com.apple.main-thread0 libsystem_kernel.dylib 0x00007fff71c6947a __pthread_kill + 101 libsystem_pthread.dylib 0x00007fff71d26707 pthread_kill + 3842 libsystem_c.dylib 0x00007fff71bf1a08 abort + 1203 com.apple.dt.IDEKit 0x000000010e201069 +[IDEAssertionHandler _handleAssertionWithLogString:assertionSignature:assertionReason:extraBacktrace:] + 12764 com.apple.dt.IDEKit 0x000000010e202718 -[IDEAssertionHandler handleUncaughtException:] + 10945 com.apple.dt.IDEKit 0x000000010e2027ee IDEHandleUncaughtException + 946 com.apple.AppKit 0x00007fff37a37086 -[NSApplication run] + 8367 com.apple.AppKit 0x00007fff37a28e7d NSApplicationMain + 7778 com.apple.dt.Xcode 0x000000010c4e7e8d main + 5419 libdyld.dylib 0x00007fff71b1a405 start + 1Thread 1:0 libsystem_pthread.dylib 0x00007fff71d235b4 start_wqthread + 0Thread 2:0 libsystem_pthread.dylib 0x00007fff71d235b4 start_wqthread + 0Thread 3:0 libsystem_kernel.dylib 0x00007fff71c63146 mach_msg_trap + 101 libsystem_kernel.dylib 0x00007fff71c636ac mach_msg + 602 com.apple.CoreFoundation 0x00007fff3a81c19b __CFRunLoopServiceMachPort + 3223 com.apple.CoreFoundation 0x00007fff3a81b737 __CFRunLoopRun + 16954 com.apple.CoreFoundation 0x00007fff3a81ae13 CFRunLoopRunSpecific + 4995 com.apple.Foundation 0x00007fff3ceb7cad -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 2126 com.apple.DTDeviceKitBase 0x0000000125ddd55e +[DTDKRemoteDeviceConnection startServiceBrowsers] + 2047 com.apple.Foundation 0x00007fff3ceadef2 __NSThread__start__ + 10648 libsystem_pthread.dylib 0x00007fff71d26d76 _pthread_start + 1259 libsystem_pthread.dylib 0x00007fff71d235d7 thread_start + 15Thread 4:0 libsystem_kernel.dylib 0x00007fff71c63146 mach_msg_trap + 101 libsystem_kernel.dylib 0x00007fff71c636ac mach_msg + 602 com.apple.CoreFoundation 0x00007fff3a81c19b __CFRunLoopServiceMachPort + 3223 com.apple.CoreFoundation 0x00007fff3a81b737 __CFRunLoopRun + 16954 com.apple.CoreFoundation 0x00007fff3a81ae13 CFRunLoopRunSpecific + 4995 com.apple.Foundation 0x00007fff3ceb7cad -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 2126 com.apple.DTDeviceKitBase 0x0000000125deb08d -[DTDKRemoteDeviceDataListener listenerThreadImplementation] + 6367 com.apple.Foundation 0x00007fff3ceadef2 __NSThread__start__ + 10648 libsystem_pthread.dylib 0x00007fff71d26d76 _pthread_start + 1259 libsystem_pthread.dylib 0x00007fff71d235d7 thread_start + 15Thread 5:: com.apple.CFSocket.private0 libsystem_kernel.dylib 0x00007fff71c6a7c6 __select + 101 com.apple.CoreFoundation 0x00007fff3a84992a __CFSocketManager + 6322 libsystem_pthread.dylib 0x00007fff71d26d76 _pthread_start + 1253 libsystem_pthread.dylib 0x00007fff71d235d7 thread_start + 15Thread 6:: JavaScriptCore bmalloc scavenger0 libsystem_kernel.dylib 0x00007fff71c668f6 __psynch_cvwait + 101 libsystem_pthread.dylib 0x00007fff71d27082 _pthread_cond_wait + 7012 libc++.1.dylib 0x00007fff6ec6b81a std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 183 com.apple.JavaScriptCore 0x00007fff3eedf714 void std::__1::condition_variable_any::wait<std::__1::unique_lock<bmalloc::Mutex> >(std::__1::unique_lock<bmalloc::Mutex>&) + 844 com.apple.JavaScriptCore 0x00007fff3eee3c2b bmalloc::Scavenger::threadRunLoop() + 3315 com.apple.JavaScriptCore 0x00007fff3eee37a9 bmalloc::Scavenger::threadEntryPoint(bmalloc::Scavenger*) + 96 com.apple.JavaScriptCore 0x00007fff3eee5fc7 void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (*)(bmalloc::Scavenger*), bmalloc::Scavenger*> >(void*) + 397 libsystem_pthread.dylib 0x00007fff71d26d76 _pthread_start + 1258 libsystem_pthread.dylib 0x00007fff71d235d7 thread_start + 15Thread 7:0 libsystem_kernel.dylib 0x00007fff71c63146 mach_msg_trap + 101 libsystem_kernel.dylib 0x00007fff71c636ac mach_msg + 602 com.apple.spotlight.index 0x00007fff694177cf _handleExceptions + 1203 libsystem_pthread.dylib 0x00007fff71d26d76 _pthread_start + 1254 libsystem_pthread.dylib 0x00007fff71d235d7 thread_start + 15Thread 8:0 libsystem_pthread.dylib 0x00007fff71d235b4 start_wqthread + 0Thread 9:: com.apple.NSEventThread0 libsystem_kernel.dylib 0x00007fff71c63146 mach_msg_trap + 101 libsystem_kernel.dylib 0x00007fff71c636ac mach_msg + 602 com.apple.CoreFoundation 0x00007fff3a81c19b __CFRunLoopServiceMachPort + 3223 com.apple.CoreFoundation 0x00007fff3a81b737 __CFRunLoopRun + 16954 com.apple.CoreFoundation 0x00007fff3a81ae13 CFRunLoopRunSpecific + 4995 com.apple.AppKit 0x00007fff37a45026 _NSEventThread + 1326 libsystem_pthread.dylib 0x00007fff71d26d76 _pthread_start + 1257 libsystem_pthread.dylib 0x00007fff71d235d7 thread_start + 15Thread 10:: DYMobileDeviceManager0 libsystem_kernel.dylib 0x00007fff71c63146 mach_msg_trap + 101 libsystem_kernel.dylib 0x00007fff71c636ac mach_msg + 602 com.apple.CoreFoundation 0x00007fff3a81c19b __CFRunLoopServiceMachPort + 3223 com.apple.CoreFoundation 0x00007fff3a81b737 __CFRunLoopRun + 16954 com.apple.CoreFoundation 0x00007fff3a81ae13 CFRunLoopRunSpecific + 4995 com.apple.Foundation 0x00007fff3ceb7cad -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 2126 com.apple.Foundation 0x00007fff3ceb7bc6 -[NSRunLoop(NSRunLoop) run] + 767 com.apple.GPUToolsMobileFoundation 0x000000012ca8d5a9 -[DYMobileDeviceManager _deviceNotificationThread:] + 1268 com.apple.Foundation 0x00007fff3ceadef2 __NSThread__start__ + 10649 libsystem_pthread.dylib 0x00007fff71d26d76 _pthread_start + 12510 libsystem_pthread.dylib 0x00007fff71d235d7 thread_start + 15Thread 11:0 libsystem_kernel.dylib 0x00007fff71c63146 mach_msg_trap + 101 libsystem_kernel.dylib 0x00007fff71c636ac mach_msg + 602 com.apple.CoreFoundation 0x00007fff3a81c19b __CFRunLoopServiceMachPort + 3223 com.apple.CoreFoundation 0x00007fff3a81b737 __CFRunLoopRun + 16954 com.apple.CoreFoundation 0x00007fff3a81ae13 CFRunLoopRunSpecific + 4995 com.apple.CoreFoundation 0x00007fff3a81abea CFRunLoopRun + 406 libSwiftPM.dylib 0x0000000131309146 closure #1 in FSEventStream.start() + 2627 libSwiftPM.dylib 0x00000001311877a2 closure #1 in Thread.init(task:) + 1468 libSwiftPM.dylib 0x00000001311878f9 thunk for @escaping @callee_guaranteed () -> () + 259 libSwiftPM.dylib 0x00000001311878be @objc ThreadImpl.main() + 4610 com.apple.Foundation 0x00007fff3ceadef2 __NSThread__start__ + 106411 libsystem_pthread.dylib 0x00007fff71d26d76 _pthread_start + 12512 libsystem_pthread.dylib 0x00007fff71d235d7 thread_start + 15Thread 12:0 libsystem_pthread.dylib 0x00007fff71d235b4 start_wqthread + 0Thread 13:0 libsystem_pthread.dylib 0x00007fff71d235b4 start_wqthread + 0Thread 14:0 libsystem_pthread.dylib 0x00007fff71d235b4 start_wqthread + 0Thread 15:0 libsystem_pthread.dylib 0x00007fff71d235b4 start_wqthread + 0Thread 16:0 libsystem_pthread.dylib 0x00007fff71d235b4 start_wqthread + 0Thread 17:0 libsystem_pthread.dylib 0x00007fff71d235b4 start_wqthread + 0Thread 18:0 libsystem_pthread.dylib 0x00007fff71d235b4 start_wqthread + 0Thread 19:: Dispatch queue: com.apple.dt.SpotlightIndexerProcess (QOS: BACKGROUND)0 com.apple.DNTDocumentationModel 0x0000000112e63030 outlined init with copy of Any + 01 com.apple.DNTDocumentationModel 0x0000000112e60400 JSON.optionalValueForKey<A>(_:) + 1442 com.apple.DNTDocumentationModel 0x0000000112e60272 JSON.valueForKey<A>(_:) + 1303 com.apple.DNTDocumentationModel 0x0000000112e611a3 JSON.jsonForKey(_:) + 1154 com.apple.DNTDocumentationSupport 0x0000000113119cf6 LanguageEntityRelationship.init(relatedEntityJSON:sourceLanguage:role:) + 2465 com.apple.DNTDocumentationSupport 0x00000001131866c1 JSON<>.ownerWithSourceLanguage(_:) + 1616 com.apple.DNTDocumentationSupport 0x000000011321e6d3 InstanceMethod.init(json:role:) + 1957 com.apple.DNTDocumentationSupport 0x000000011321f0e9 protocol witness for WebJSONInitializable.init(json:role:) in conformance InstanceMethod + 98 com.apple.DNTDocumentationSupport 0x0000000113171037 static DocumentationService.entityForJSONDictionary(_:) + 3599 com.apple.DNTDocumentationSupport 0x00000001131707ec DocumentationService.deserializeEntity(cachePair:) + 113210 com.apple.DNTDocumentationSupport 0x00000001130f1c48 specialized Sequence.map<A>(_:) + 36011 com.apple.DNTDocumentationSupport 0x00000001130eec09 IndexOperation.main() + 32912 com.apple.DNTDocumentationSupport 0x00000001130ef838 @objc IndexOperation.main() + 2413 com.apple.Foundation 0x00007fff3d0622c0 __NSOPERATION_IS_INVOKING_MAIN__ + 1714 com.apple.Foundation 0x00007fff3cec7af4 -[NSOperation start] + 73115 com.apple.Foundation 0x00007fff3d0626ce __NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 1716 com.apple.Foundation 0x00007fff3cef0ed8 __NSOQSchedule_f + 18217 libdispatch.dylib 0x00007fff71ad6143 _dispatch_block_async_invoke2 + 8318 libdispatch.dylib 0x00007fff71aca4de _dispatch_client_callout + 819 libdispatch.dylib 0x00007fff71acc690 _dispatch_continuation_pop + 41420 libdispatch.dylib 0x00007fff71acbd8e _dispatch_async_redirect_invoke + 70321 libdispatch.dylib 0x00007fff71ad87e5 _dispatch_root_queue_drain + 32622 libdispatch.dylib 0x00007fff71ad8f25 _dispatch_worker_thread2 + 9223 libsystem_pthread.dylib 0x00007fff71d2371d _pthread_wqthread + 22024 libsystem_pthread.dylib 0x00007fff71d235c3 start_wqthread + 15Thread 20:0 libsystem_pthread.dylib 0x00007fff71d235b4 start_wqthread + 0Thread 21:0 libsystem_pthread.dylib 0x00007fff71d235b4 start_wqthread + 0Thread 22:0 libsystem_kernel.dylib 0x00007fff71c67012 __semwait_signal + 101 libsystem_c.dylib 0x00007fff71bea122 nanosleep + 1962 com.apple.CoreSymbolicationDT 0x000000010f279391 cleaner_thread_main(void*) + 413 libsystem_pthread.dylib 0x00007fff71d26d76 _pthread_start + 1254 libsystem_pthread.dylib 0x00007fff71d235d7 thread_start + 15Thread 0 crashed with X86 Thread State (64-bit): rax: 0x0000000000000000 rbx: 0x0000000114220d40 rcx: 0x00007ffee3719788 rdx: 0x0000000000000000 rdi: 0x0000000000000307 rsi: 0x0000000000000006 rbp: 0x00007ffee37197b0 rsp: 0x00007ffee3719788 r8: 0x000000010ea9c6b8 r9: 0x0000000000000012 r10: 0x0000000000000000 r11: 0x0000000000000246 r12: 0x0000000000000307 r13: 0x00007fff962e1560 r14: 0x0000000000000006 r15: 0x0000000000000016 rip: 0x00007fff71c6947a rfl: 0x0000000000000246 cr2: 0x00007fc5db92ad00Logical CPU: 0Error Code: 0x02000148Trap Number: 133