After 2 weeks of research we were able to solve this. We had objective c code in our code base - NSUserActivity+MediaPlayerAdditions.h commenting out all the code from that file solved the issue. NS_ASSUME_NONNULL_BEGIN @interface NSUserActivity (MediaPlayerAdditions) /// A unique identifier relative to the app's media content catalog for the displayed media item. @property (nonatomic, copy, nullable) NSString *externalMediaContentIdentifier NS_AVAILABLE_IOS(10_1) TVOS_AVAILABLE(10_0_1) WATCHOS_UNAVAILABLE; @end NS_ASSUME_NONNULL_END Hope this will help something solving this.

I'm facing the same issue too. It was working fine till Xcode 12 beta 2 but since beta 3 it is crashing. Tried many things but not able to get to a conclusion. Path:									/Users/USER/Downloads/Xcode.app/Contents/MacOS/Xcode Identifier:						com.apple.dt.Xcode Version:							 12.0 (17219) Build Info:						IDEFrameworks-17219000000000000~2 (12A7209) Code Type:						 X86-64 (Native) Parent Process:				??? [1] Responsible:					 Xcode [2742] User ID:							 882789207 Date/Time:						 2020-09-28 16:24:52.905 -0400 OS Version:						Mac OS X 10.15.4 (19E287) Report Version:				12 Bridge OS Version:		 3.0 (14Y908) Anonymous UUID:				42335963-5875-5860-05E1-3D2F68B041CF Time Awake Since Boot: 780 seconds System Integrity Protection: enabled Crashed Thread:				19	Dispatch queue: XCBuild.XCBBuildOperation.buildOperationHandlerQueue Exception Type:				EXC_BAD_INSTRUCTION (SIGILL) Exception Codes:			 0x0000000000000001, 0x0000000000000000 Exception Note:				EXC_CORPSE_NOTIFY Termination Signal:		Illegal instruction: 4 Termination Reason:		Namespace SIGNAL, Code 0x4 Terminating Process:	 exc handler [2742] Application Specific Information: ProductBuildVersion: 12A7209 Thread 0:: Dispatch queue: com.apple.main-thread 0	 com.apple.CoreFoundation			 0x00007fff348ee871 _CFRelease + 502 1	 com.apple.CoreFoundation			 0x00007fff348619ee CFRunLoopTimerSetNextFireDate + 472 2	 com.apple.CoreFoundation			 0x00007fff348224f5 CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION + 23 3	 com.apple.CoreFoundation			 0x00007fff34822427 __CFRunLoopDoObservers + 457