The issue is present in XCode 11 GM seed 2. See below stack trace
Process: Xcode [15452]
Path: /Users/USER/Downloads/Xcode-beta.app/Contents/MacOS/Xcode
Identifier: com.apple.dt.Xcode
Version: 11.2 (15519)
Build Info: IDEFrameworks-15519000000000000~20 (11B44)
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: Xcode [15452]
User ID: 501
Date/Time: 2019-10-30 14:12:30.728 +0530
OS Version: Mac OS X 10.15 (19A603)
Report Version: 12
Bridge OS Version: 4.0 (17P572)
Anonymous UUID: 51B49748-1EE9-9601-05D7-15D35CBF7B9C
Sleep/Wake UUID: EC7E284A-1F3A-4636-ABB9-76A6CD43BBCF
Time Awake Since Boot: 11000 seconds
Time Since Wake: 960 seconds
System Integrity Protection: enabled
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Application Specific Information:
ProductBuildVersion: 11B44
UNCAUGHT EXCEPTION (NSInvalidArgumentException): -[IBUIColor colorUsingColorSpaceName:]: unrecognized selector sent to instance 0x7fc5ee02a440
UserInfo: (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() called
Application Specific Signatures:
NSInvalidArgumentException
Application Specific Backtrace 1:
0 CoreFoundation 0x00007fff3a8ccd63 __exceptionPreprocess + 250
1 DVTFoundation 0x000000010c7c3a29 DVTFailureHintExceptionPreprocessor + 205
2 libobjc.A.dylib 0x00007fff707bbbd4 objc_exception_throw + 48
3 CoreFoundation 0x00007fff3a957206 -[NSObject(NSObject) __retain_OA] + 0
4 CoreFoundation 0x00007fff3a87351b ___forwarding___ + 1427
5 CoreFoundation 0x00007fff3a872ef8 _CF_forwarding_prep_0 + 120
6 AppKit 0x00007fff37f45038 -[NSColorPickerPencilView(NSPencilCore) _pencilWithColor:] + 297
7 AppKit 0x00007fff37f4419c -[NSColorPickerPencilView setColor:] + 27
8 AppKit 0x00007fff37f41bec -[NSColorPanel _withColorSettingDisabled:] + 37
9 AppKit 0x00007fff37f42088 -[NSColorPanel _forceSetColor:] + 108
10 AppKit 0x00007fff37f41ea0 -[NSColorPanel setColor:] + 119
11 AppKit 0x00007fff37a9f487 -[NSTextView updateFontPanel] + 1949
12 AppKit 0x00007fff37bfd73d -[NSTextView(NSSharing) becomeFirstResponder] + 271
13 IDEKit 0x000000010e68bb91 -[IDEAttributedStringControlTextView becomeFirstResponder] + 42
14 AppKit 0x00007fff37b6c00a -[NSWindow _realMakeFirstResponder:] + 415
15 AppKit 0x00007fff37c4145d -[NSWindow(NSEventRouting) _handleMouseDownEvent:isDelayedEvent:] + 3983
16 AppKit 0x00007fff37b84e80 -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] + 2612
17 AppKit 0x00007fff37b8420d -[NSWindow(NSEventRouting) sendEvent:] + 349
18 IDEKit 0x000000010e23f56b -[IDEWorkspaceWindow sendEvent:] + 154
19 AppKit 0x00007fff37a47618 -[NSApplication(NSEvent) sendEvent:] + 352
20 IDEKit 0x000000010e2856c7 -[IDEApplication sendEvent:] + 922
21 AppKit 0x00007fff37a37005 -[NSApplication run] + 707
22 AppKit 0x00007fff37a28e7d NSApplicationMain + 777
23 Xcode 0x000000010c4e7e8d main + 541
24 libdyld.dylib 0x00007fff71b1a405 start + 1
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x00007fff71c6947a __pthread_kill + 10
1 libsystem_pthread.dylib 0x00007fff71d26707 pthread_kill + 384
2 libsystem_c.dylib 0x00007fff71bf1a08 abort + 120
3 com.apple.dt.IDEKit 0x000000010e201069 +[IDEAssertionHandler _handleAssertionWithLogString:assertionSignature:assertionReason:extraBacktrace:] + 1276
4 com.apple.dt.IDEKit 0x000000010e202718 -[IDEAssertionHandler handleUncaughtException:] + 1094
5 com.apple.dt.IDEKit 0x000000010e2027ee IDEHandleUncaughtException + 94
6 com.apple.AppKit 0x00007fff37a37086 -[NSApplication run] + 836
7 com.apple.AppKit 0x00007fff37a28e7d NSApplicationMain + 777
8 com.apple.dt.Xcode 0x000000010c4e7e8d main + 541
9 libdyld.dylib 0x00007fff71b1a405 start + 1
Thread 1:
0 libsystem_pthread.dylib 0x00007fff71d235b4 start_wqthread + 0
Thread 2:
0 libsystem_pthread.dylib 0x00007fff71d235b4 start_wqthread + 0
Thread 3:
0 libsystem_kernel.dylib 0x00007fff71c63146 mach_msg_trap + 10
1 libsystem_kernel.dylib 0x00007fff71c636ac mach_msg + 60
2 com.apple.CoreFoundation 0x00007fff3a81c19b __CFRunLoopServiceMachPort + 322
3 com.apple.CoreFoundation 0x00007fff3a81b737 __CFRunLoopRun + 1695
4 com.apple.CoreFoundation 0x00007fff3a81ae13 CFRunLoopRunSpecific + 499
5 com.apple.Foundation 0x00007fff3ceb7cad -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 212
6 com.apple.DTDeviceKitBase 0x0000000125ddd55e +[DTDKRemoteDeviceConnection startServiceBrowsers] + 204
7 com.apple.Foundation 0x00007fff3ceadef2 __NSThread__start__ + 1064
8 libsystem_pthread.dylib 0x00007fff71d26d76 _pthread_start + 125
9 libsystem_pthread.dylib 0x00007fff71d235d7 thread_start + 15
Thread 4:
0 libsystem_kernel.dylib 0x00007fff71c63146 mach_msg_trap + 10
1 libsystem_kernel.dylib 0x00007fff71c636ac mach_msg + 60
2 com.apple.CoreFoundation 0x00007fff3a81c19b __CFRunLoopServiceMachPort + 322
3 com.apple.CoreFoundation 0x00007fff3a81b737 __CFRunLoopRun + 1695
4 com.apple.CoreFoundation 0x00007fff3a81ae13 CFRunLoopRunSpecific + 499
5 com.apple.Foundation 0x00007fff3ceb7cad -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 212
6 com.apple.DTDeviceKitBase 0x0000000125deb08d -[DTDKRemoteDeviceDataListener listenerThreadImplementation] + 636
7 com.apple.Foundation 0x00007fff3ceadef2 __NSThread__start__ + 1064
8 libsystem_pthread.dylib 0x00007fff71d26d76 _pthread_start + 125
9 libsystem_pthread.dylib 0x00007fff71d235d7 thread_start + 15
Thread 5:: com.apple.CFSocket.private
0 libsystem_kernel.dylib 0x00007fff71c6a7c6 __select + 10
1 com.apple.CoreFoundation 0x00007fff3a84992a __CFSocketManager + 632
2 libsystem_pthread.dylib 0x00007fff71d26d76 _pthread_start + 125
3 libsystem_pthread.dylib 0x00007fff71d235d7 thread_start + 15
Thread 6:: JavaScriptCore bmalloc scavenger
0 libsystem_kernel.dylib 0x00007fff71c668f6 __psynch_cvwait + 10
1 libsystem_pthread.dylib 0x00007fff71d27082 _pthread_cond_wait + 701
2 libc++.1.dylib 0x00007fff6ec6b81a std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
3 com.apple.JavaScriptCore 0x00007fff3eedf714 void std::__1::condition_variable_any::wait<std::__1::unique_lock<bmalloc::Mutex> >(std::__1::unique_lock<bmalloc::Mutex>&) + 84
4 com.apple.JavaScriptCore 0x00007fff3eee3c2b bmalloc::Scavenger::threadRunLoop() + 331
5 com.apple.JavaScriptCore 0x00007fff3eee37a9 bmalloc::Scavenger::threadEntryPoint(bmalloc::Scavenger*) + 9
6 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*) + 39
7 libsystem_pthread.dylib 0x00007fff71d26d76 _pthread_start + 125
8 libsystem_pthread.dylib 0x00007fff71d235d7 thread_start + 15
Thread 7:
0 libsystem_kernel.dylib 0x00007fff71c63146 mach_msg_trap + 10
1 libsystem_kernel.dylib 0x00007fff71c636ac mach_msg + 60
2 com.apple.spotlight.index 0x00007fff694177cf _handleExceptions + 120
3 libsystem_pthread.dylib 0x00007fff71d26d76 _pthread_start + 125
4 libsystem_pthread.dylib 0x00007fff71d235d7 thread_start + 15
Thread 8:
0 libsystem_pthread.dylib 0x00007fff71d235b4 start_wqthread + 0
Thread 9:: com.apple.NSEventThread
0 libsystem_kernel.dylib 0x00007fff71c63146 mach_msg_trap + 10
1 libsystem_kernel.dylib 0x00007fff71c636ac mach_msg + 60
2 com.apple.CoreFoundation 0x00007fff3a81c19b __CFRunLoopServiceMachPort + 322
3 com.apple.CoreFoundation 0x00007fff3a81b737 __CFRunLoopRun + 1695
4 com.apple.CoreFoundation 0x00007fff3a81ae13 CFRunLoopRunSpecific + 499
5 com.apple.AppKit 0x00007fff37a45026 _NSEventThread + 132
6 libsystem_pthread.dylib 0x00007fff71d26d76 _pthread_start + 125
7 libsystem_pthread.dylib 0x00007fff71d235d7 thread_start + 15
Thread 10:: DYMobileDeviceManager
0 libsystem_kernel.dylib 0x00007fff71c63146 mach_msg_trap + 10
1 libsystem_kernel.dylib 0x00007fff71c636ac mach_msg + 60
2 com.apple.CoreFoundation 0x00007fff3a81c19b __CFRunLoopServiceMachPort + 322
3 com.apple.CoreFoundation 0x00007fff3a81b737 __CFRunLoopRun + 1695
4 com.apple.CoreFoundation 0x00007fff3a81ae13 CFRunLoopRunSpecific + 499
5 com.apple.Foundation 0x00007fff3ceb7cad -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 212
6 com.apple.Foundation 0x00007fff3ceb7bc6 -[NSRunLoop(NSRunLoop) run] + 76
7 com.apple.GPUToolsMobileFoundation 0x000000012ca8d5a9 -[DYMobileDeviceManager _deviceNotificationThread:] + 126
8 com.apple.Foundation 0x00007fff3ceadef2 __NSThread__start__ + 1064
9 libsystem_pthread.dylib 0x00007fff71d26d76 _pthread_start + 125
10 libsystem_pthread.dylib 0x00007fff71d235d7 thread_start + 15
Thread 11:
0 libsystem_kernel.dylib 0x00007fff71c63146 mach_msg_trap + 10
1 libsystem_kernel.dylib 0x00007fff71c636ac mach_msg + 60
2 com.apple.CoreFoundation 0x00007fff3a81c19b __CFRunLoopServiceMachPort + 322
3 com.apple.CoreFoundation 0x00007fff3a81b737 __CFRunLoopRun + 1695
4 com.apple.CoreFoundation 0x00007fff3a81ae13 CFRunLoopRunSpecific + 499
5 com.apple.CoreFoundation 0x00007fff3a81abea CFRunLoopRun + 40
6 libSwiftPM.dylib 0x0000000131309146 closure #1 in FSEventStream.start() + 262
7 libSwiftPM.dylib 0x00000001311877a2 closure #1 in Thread.init(task:) + 146
8 libSwiftPM.dylib 0x00000001311878f9 thunk for @escaping @callee_guaranteed () -> () + 25
9 libSwiftPM.dylib 0x00000001311878be @objc ThreadImpl.main() + 46
10 com.apple.Foundation 0x00007fff3ceadef2 __NSThread__start__ + 1064
11 libsystem_pthread.dylib 0x00007fff71d26d76 _pthread_start + 125
12 libsystem_pthread.dylib 0x00007fff71d235d7 thread_start + 15
Thread 12:
0 libsystem_pthread.dylib 0x00007fff71d235b4 start_wqthread + 0
Thread 13:
0 libsystem_pthread.dylib 0x00007fff71d235b4 start_wqthread + 0
Thread 14:
0 libsystem_pthread.dylib 0x00007fff71d235b4 start_wqthread + 0
Thread 15:
0 libsystem_pthread.dylib 0x00007fff71d235b4 start_wqthread + 0
Thread 16:
0 libsystem_pthread.dylib 0x00007fff71d235b4 start_wqthread + 0
Thread 17:
0 libsystem_pthread.dylib 0x00007fff71d235b4 start_wqthread + 0
Thread 18:
0 libsystem_pthread.dylib 0x00007fff71d235b4 start_wqthread + 0
Thread 19:: Dispatch queue: com.apple.dt.SpotlightIndexerProcess (QOS: BACKGROUND)
0 com.apple.DNTDocumentationModel 0x0000000112e63030 outlined init with copy of Any + 0
1 com.apple.DNTDocumentationModel 0x0000000112e60400 JSON.optionalValueForKey<A>(_:) + 144
2 com.apple.DNTDocumentationModel 0x0000000112e60272 JSON.valueForKey<A>(_:) + 130
3 com.apple.DNTDocumentationModel 0x0000000112e611a3 JSON.jsonForKey(_:) + 115
4 com.apple.DNTDocumentationSupport 0x0000000113119cf6 LanguageEntityRelationship.init(relatedEntityJSON:sourceLanguage:role:) + 246
5 com.apple.DNTDocumentationSupport 0x00000001131866c1 JSON<>.ownerWithSourceLanguage(_:) + 161
6 com.apple.DNTDocumentationSupport 0x000000011321e6d3 InstanceMethod.init(json:role:) + 195
7 com.apple.DNTDocumentationSupport 0x000000011321f0e9 protocol witness for WebJSONInitializable.init(json:role:) in conformance InstanceMethod + 9
8 com.apple.DNTDocumentationSupport 0x0000000113171037 static DocumentationService.entityForJSONDictionary(_:) + 359
9 com.apple.DNTDocumentationSupport 0x00000001131707ec DocumentationService.deserializeEntity(cachePair:) + 1132
10 com.apple.DNTDocumentationSupport 0x00000001130f1c48 specialized Sequence.map<A>(_:) + 360
11 com.apple.DNTDocumentationSupport 0x00000001130eec09 IndexOperation.main() + 329
12 com.apple.DNTDocumentationSupport 0x00000001130ef838 @objc IndexOperation.main() + 24
13 com.apple.Foundation 0x00007fff3d0622c0 __NSOPERATION_IS_INVOKING_MAIN__ + 17
14 com.apple.Foundation 0x00007fff3cec7af4 -[NSOperation start] + 731
15 com.apple.Foundation 0x00007fff3d0626ce __NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 17
16 com.apple.Foundation 0x00007fff3cef0ed8 __NSOQSchedule_f + 182
17 libdispatch.dylib 0x00007fff71ad6143 _dispatch_block_async_invoke2 + 83
18 libdispatch.dylib 0x00007fff71aca4de _dispatch_client_callout + 8
19 libdispatch.dylib 0x00007fff71acc690 _dispatch_continuation_pop + 414
20 libdispatch.dylib 0x00007fff71acbd8e _dispatch_async_redirect_invoke + 703
21 libdispatch.dylib 0x00007fff71ad87e5 _dispatch_root_queue_drain + 326
22 libdispatch.dylib 0x00007fff71ad8f25 _dispatch_worker_thread2 + 92
23 libsystem_pthread.dylib 0x00007fff71d2371d _pthread_wqthread + 220
24 libsystem_pthread.dylib 0x00007fff71d235c3 start_wqthread + 15
Thread 20:
0 libsystem_pthread.dylib 0x00007fff71d235b4 start_wqthread + 0
Thread 21:
0 libsystem_pthread.dylib 0x00007fff71d235b4 start_wqthread + 0
Thread 22:
0 libsystem_kernel.dylib 0x00007fff71c67012 __semwait_signal + 10
1 libsystem_c.dylib 0x00007fff71bea122 nanosleep + 196
2 com.apple.CoreSymbolicationDT 0x000000010f279391 cleaner_thread_main(void*) + 41
3 libsystem_pthread.dylib 0x00007fff71d26d76 _pthread_start + 125
4 libsystem_pthread.dylib 0x00007fff71d235d7 thread_start + 15
Thread 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: 0x00007fc5db92ad00
Logical CPU: 0
Error Code: 0x02000148
Trap Number: 133