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CameraUI -[CAMPriorityNotificationCenter _removeObserver:fromObserversByName:] i am seeing crashes on firebase and here is the stacktrace Fatal Exception: NSGenericException *** Collection <__NSArrayM: 0x28024a0a0> was mutated while being enumerated. keyboard_arrow_up 0 CoreFoundation __exceptionPreprocess 2 arrow_drop_down CoreFoundation -[__NSSingleObjectEnumerator initWithObject:collection:] arrow_right 3 CameraUI -[CAMPriorityNotificationCenter _removeObserver:fromObserversByName:] 4 CameraUI -[CAMPriorityNotificationCenter removeObserver:] 13 arrow_drop_down libsystem_pthread.dylib start_wqthread Crashed: com.google.firebase.crashlytics.ios.exception SIGABRT ABORT 0x00000001c1eb7334 keyboard_arrow_up 0 FirebaseCrashlytics FIRCLSProcess.c - Line 393 FIRCLSProcessRecordAllThreads + 393 1 FirebaseCrashlytics FIRCLSProcess.c - Line 424 FIRCLSProcessRecordAllThreads + 424 2 FirebaseCrashlytics FIRCLSHandler.m - Line 34 FIRCLSHandler + 34 3 FirebaseCrashlytics FIRCLSException.mm - Line 218 __FIRCLSExceptionRecord_block_invoke + 218 4 libdispatch.dylib _dispatch_client_callout + 20 5 arrow_drop_down libdispatch.dylib _dispatch_lane_barrier_sync_invoke_and_complete + 60 6 FirebaseCrashlytics FIRCLSException.mm - Line 225 FIRCLSExceptionRecord + 225 7 FirebaseCrashlytics FIRCLSException.mm - Line 111 FIRCLSExceptionRecordNSException + 111 8 FirebaseCrashlytics FIRCLSException.mm - Line 279 FIRCLSTerminateHandler() + 279 9 libc++abi.dylib std::__terminate(void (*)()) + 20 24 arrow_drop_down libsystem_pthread.dylib start_wqthread + 8 This started happening in 14.4 and above and was working fine in the previous version and am recently seeing an increase in the crash. Is it an OS or am i doing something wrong

Since yesterday 17th feb 2020 i am getting this error SDK Version Issue. This app was built with the iOS SDK. All iOS apps submitted to the App Store must be built with the iOS 11 SDK or later, included in Xcode 9 or later. Further, starting March 2019, all iOS apps submitted to the App Store must be built with the iOS 12.1 SDK or later, included in Xcode 10.1 or later. and am unable to upload the build.It was working like a week back ,i am getting the same error even after reinstalling xcodeI even upgraded the language to swift5 and it did not work