问题类似于：link，但App特定消息似乎有点不同。希望有人会说:(插入简单的程序），你可以解决你的问题！不太可能，所以发布这个主要是为了把这个问题放在那里。
以下是生成的崩溃报告的第一部分（整个真的长）：
Process: Xcode [693]
Path: /Applications/Xcode.app/Contents/MacOS/Xcode
Identifier: com.apple.dt.Xcode
Version: 6.3.1 (7703)
Build Info: IDEFrameworks-7703000000000000~4
App Item ID: 497799835
App External ID: 812230896
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: Xcode [693]
User ID: 501
Date/Time: 2015-04-24 09:17:20.460 +0800
OS Version: Mac OS X 10.10.3 (14D136)
Report Version: 11
Anonymous UUID: A069458D-BAB6-76AB-047A-F3E94B6484C3
Time Awake Since Boot: 450 seconds
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Application Specific Information:
ProductBuildVersion: 6D1002
ASSERTION FAILURE in /SourceCache/DVTFrameworks/DVTFrameworks-7703/DVTFoundation/Protocols/DVTInvalidation.m:216
Details: Message sent to invalidated object: <IDEKeyDrivenNavigableItem_AnyDVTLandmarkItemSwift, 0x7fb299f60830>.
Backtrace for invalidation:
0 0x0000000107fd4015 -[DVTInvalidationMixIn invalidate] (in DVTFoundation)
1 0x00000001091d475f -[IDENavigableItemCoordinator forgetItems:] (in IDEKit)
2 0x00000001091e331b -[IDENavigableItemCoordinator forgetNavigableItems:] (in IDEKit)
3 0x0000000109264eca -[IDENavigableItem _updateMutableChildItems:forChangeKind:atIndexes:] (in IDEKit)
4 0x00000001092649b8 -[IDENavigableItem updateChildItemsForChangeKind:atIndexes:] (in IDEKit)
5 0x00000001094351a1 __46-[IDEFileNavigableItem _updateEditorDocument:]_block_invoke (in IDEKit)
6 0x00000001080f7a9b __73-[DVTObservingBlockToken observeValueForKeyPath:ofObject:change:context:]_block_invoke183 (in DVTFoundation)
7 0x000000010806f55c DVTInvokeWithStrongOwnership (in DVTFoundation)
8 0x0000000107f208ac -[DVTObservingBlockToken observeValueForKeyPath:ofObject:change:context:] (in DVTFoundation)
9 0x00007fff97d8b0f3 NSKeyValueNotifyObserver (in Foundation)
10 0x00007fff97d97d68 NSKeyValueDidChange (in Foundation)
11 0x00007fff97d5097d -[NSObject(NSKeyValueObserverNotification) didChangeValueForKey:] (in Foundation)
12 0x000000011293e12f -[IDESourceCodeDocument textStorageDidUpdateSourceLandmarks:] (in IDESourceEditor)
13 0x00000001085ab416 -[DVTTextStorage _invalidateSourceLandmarks:] (in DVTKit)
14 0x0000000108574a61 -[DVTTextStorage topSourceLandmark] (in DVTKit)
15 0x0000000108589f04 -[DVTTextStorage sourceLandmarkAtCharacterIndex:] (in DVTKit)
16 0x000000011299e288 -[IDESourceCodeEditor _currentSelectedLandmarkItem] (in IDESourceEditor)
17 0x000000011299e0ff -[IDESourceCodeEditor _refreshCurrentSelectedItemsIfNeeded] (in IDESourceEditor)
18 0x000000011293d7fa -[IDESourceCodeEditor currentSelectedItems] (in IDESourceEditor)
19 0x0000000109346542 __52-[IDEEditorContext _updateSubDocumentNavigableItems]_block_invoke (in IDEKit)
20 0x000000010919751a -[IDEEditorContext _performBlockInsideReentrantGuard:] (in IDEKit)
21 0x00000001091f2bf8 -[IDEEditorContext _updateSubDocumentNavigableItems] (in IDEKit)
22 0x00000001091f96e6 -[IDEEditorContext _greatestDocumentAncestorWasForgotten] (in IDEKit)
23 0x000000010933e546 __43-[IDEEditorContext initWithNibName:bundle:]_block_invoke144 (in IDEKit)
24 0x00000001080c3574 -[_DVTNotificationReceiver receiveNotification:] (in DVTFoundation)
25 0x00007fff959bd45c __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ (in CoreFoundation)
26 0x00007fff958ad634 _CFXNotificationPost (in CoreFoundation)
27 0x00007fff97d509d1 -[NSNotificationCenter postNotificationName:object:userInfo:] (in Foundation)
28 0x00000001080c4118 -[NSNotificationCenter(DVTNSNotificationCenterAdditions) _dvt_postNotificationName:object:userInfo:] (in DVTFoundation)
29 0x00000001094762ba -[IDENavigableItemCoordinator _postWillForgetNotification:] (in IDEKit)
30 0x00000001091d4694 -[IDENavigableItemCoordinator forgetItems:] (in IDEKit)
31 0x00000001091e331b -[IDENavigableItemCoordinator forgetNavigableItems:] (in IDEKit)
32 0x0000000109264eca -[IDENavigableItem _updateMutableChildItems:forChangeKind:atIndexes:] (in IDEKit)
33 0x00000001092649b8 -[IDENavigableItem updateChildItemsForChangeKind:atIndexes:] (in IDEKit)
34 0x000000010923471c -[IDEContainerFileReferenceNavigableItem updateChildRepresentedObjects] (in IDEKit)
35 0x00000001091cdc7a -[_IDEContainerItemNavigableItemExtraInfo processModelObjectGraphNotification:] (in IDEKit)
36 0x00007fff97d842cc -[__NSObserver _doit:] (in Foundation)
37 0x00007fff959bd45c __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ (in CoreFoundation)
38 0x00007fff958ad634 _CFXNotificationPost (in CoreFoundation)
39 0x00007fff97d509d1 -[NSNotificationCenter postNotificationName:object:userInfo:] (in Foundation)
40 0x00000001080c4118 -[NSNotificationCenter(DVTNSNotificationCenterAdditions) _dvt_postNotificationName:object:userInfo:] (in DVTFoundation)
41 0x0000000107f6396b -[DVTModelObjectGraph _coalescingTick] (in DVTFoundation)
42 0x0000000108053fe3 __58-[DVTModelObjectGraph performBlockCoalescingModelChanges:]_block_invoke (in DVTFoundation)
43 0x00000001080d687a -[DVTModelGraphTransactionScope performTransaction:] (in DVTFoundation)
44 0x0000000108053ed9 -[DVTModelObjectGraph performBlockCoalescingModelChanges:] (in DVTFoundation)
45 0x0000000108d4bffa +[IDEContainer _invalidateContainer:] (in IDEFoundation)
46 0x0000000108aeb86b -[IDEContainer _respondToFileChangeOnDiskWithFilePath:] (in IDEFoundation)
47 0x0000000108aeaea3 -[IDEContainer _filePathDidChangeWithPendingChangeDictionary] (in IDEFoundation)
48 0x00007fff97d9441b __NSFireDelayedPerform (in Foundation)
49 0x00007fff959542e4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ (in CoreFoundation)
50 0x00007fff95953f73 __CFRunLoopDoTimer (in CoreFoundation)
51 0x00007fff959c753d __CFRunLoopDoTimers (in CoreFoundation)
52 0x00007fff9590f608 __CFRunLoopRun (in CoreFoundation)
53 0x00007fff9590ebd8 CFRunLoopRunSpecific (in CoreFoundation)
54 0x00007fff8cc3556f RunCurrentEventLoopInMode (in HIToolbox)
55 0x00007fff8cc352ea ReceiveNextEventCommon (in HIToolbox)
56 0x00007fff8cc3512b _BlockUntilNextEventMatchingListInModeWithFilter (in HIToolbox)
57 0x00007fff970209bb _DPSNextEvent (in AppKit)
58 0x00007fff9701ff68 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] (in AppKit)
59 0x0000000108668dda -[DVTApplication nextEventMatchingMask:untilDate:inMode:dequeue:] (in DVTKit)
60 0x00007fff97015bf3 -[NSApplication run] (in AppKit)
61 0x00007fff96f92354 NSApplicationMain (in AppKit)
62 0x00007fff95d5e5c9 start (in libdyld.dylib)
63 0x0000000000000001
Function: void DVTInvalidationCoreInvalidateInline(NSObject<DVTInvalidation> *__strong)
Thread: <NSThread: 0x7fb291616e20>{number = 1, name = main}
Hints: None
Backtrace:
0 0x00000001093890a2 -[IDEAssertionHandler handleFailureInFunction:fileName:lineNumber:assertionSignature:messageFormat:arguments:] (in IDEKit)
1 0x00000001080e4c2b _DVTAssertionHandler (in DVTFoundation)
2 0x00000001080e4e8e _DVTAssertionFailureHandler (in DVTFoundation)
3 0x0000000107fd41d7 -[DVTInvalidationMixIn invalidate] (in DVTFoundation)
4 0x00000001091d475f -[IDENavigableItemCoordinator forgetItems:] (in IDEKit)
5 0x00000001091e331b -[IDENavigableItemCoordinator forgetNavigableItems:] (in IDEKit)
6 0x0000000109264eca -[IDENavigableItem _updateMutableChildItems:forChangeKind:atIndexes:] (in IDEKit)
7 0x00000001092649b8 -[IDENavigableItem updateChildItemsForChangeKind:atIndexes:] (in IDEKit)
8 0x000000010923471c -[IDEContainerFileReferenceNavigableItem updateChildRepresentedObjects] (in IDEKit)
9 0x00000001091cdc7a -[_IDEContainerItemNavigableItemExtraInfo processModelObjectGraphNotification:] (in IDEKit)
10 0x00007fff97d842cc -[__NSObserver _doit:] (in Foundation)
11 0x00007fff959bd45c __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ (in CoreFoundation)
12 0x00007fff958ad634 _CFXNotificationPost (in CoreFoundation)
13 0x00007fff97d509d1 -[NSNotificationCenter postNotificationName:object:userInfo:] (in Foundation)
14 0x00000001080c4118 -[NSNotificationCenter(DVTNSNotificationCenterAdditions) _dvt_postNotificationName:object:userInfo:] (in DVTFoundation)
15 0x0000000107f6396b -[DVTModelObjectGraph _coalescingTick] (in DVTFoundation)
16 0x0000000108053fe3 __58-[DVTModelObjectGraph performBlockCoalescingModelChanges:]_block_invoke (in DVTFoundation)
17 0x00000001080d687a -[DVTModelGraphTransactionScope performTransaction:] (in DVTFoundation)
18 0x0000000108053ed9 -[DVTModelObjectGraph performBlockCoalescingModelChanges:] (in DVTFoundation)
19 0x0000000108d4bffa +[IDEContainer _invalidateContainer:] (in IDEFoundation)
20 0x0000000108aeb86b -[IDEContainer _respondToFileChangeOnDiskWithFilePath:] (in IDEFoundation)
21 0x0000000108aeaea3 -[IDEContainer _filePathDidChangeWithPendingChangeDictionary] (in IDEFoundation)
22 0x00007fff97d9441b __NSFireDelayedPerform (in Foundation)
23 0x00007fff959542e4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ (in CoreFoundation)
24 0x00007fff95953f73 __CFRunLoopDoTimer (in CoreFoundation)
25 0x00007fff959c753d __CFRunLoopDoTimers (in CoreFoundation)
26 0x00007fff9590f608 __CFRunLoopRun (in CoreFoundation)
27 0x00007fff9590ebd8 CFRunLoopRunSpecific (in CoreFoundation)
28 0x00007fff8cc3556f RunCurrentEventLoopInMode (in HIToolbox)
29 0x00007fff8cc352ea ReceiveNextEventCommon (in HIToolbox)
30 0x00007fff8cc3512b _BlockUntilNextEventMatchingListInModeWithFilter (in HIToolbox)
31 0x00007fff970209bb _DPSNextEvent (in AppKit)
32 0x00007fff9701ff68 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] (in AppKit)
33 0x0000000108668dda -[DVTApplication nextEventMatchingMask:untilDate:inMode:dequeue:] (in DVTKit)
34 0x00007fff97015bf3 -[NSApplication run] (in AppKit)
35 0x00007fff96f92354 NSApplicationMain (in AppKit)
36 0x00007fff95d5e5c9 start (in libdyld.dylib)
37 0x0000000000000001
abort() called