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將Xcode升級到6.1.1之後，有一個項目我無法再打開。它發生在「加載xxx ...」。下面是轉儲：Xcode 6.1.1在打開項目時崩潰。爲什麼？
Process: Xcode [9343]
Path: /Applications/Xcode.app/Contents/MacOS/Xcode
Identifier: com.apple.dt.Xcode
Version: 6.1.1 (6611)
Build Info: IDEFrameworks-6611000000000000~4
App Item ID: 497799835
App External ID: 810788292
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: Xcode [9343]
User ID: 503
Date/Time: 2014-12-04 09:13:16.198 -0500
OS Version: Mac OS X 10.10.2 (14C68k)
Report Version: 11
Anonymous UUID: 4D866B4F-CB26-6063-CCCD-E67B869C790D
Sleep/Wake UUID: AFB5AAC7-3418-4089-9431-D5F33891A437
Time Awake Since Boot: 12000 seconds
Time Since Wake: 1100 seconds
Crashed Thread: 10 Dispatch queue: IBPlatformToolRequestQueue.IBCocoaTouchFramework-EightAndLater
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Application Specific Information:
ProductBuildVersion: 6A2008a
UNCAUGHT EXCEPTION (IBAssertionFailure): ASSERTION FAILURE: [item ibBaselineCount] >= 1
Reason: An item that references the first attribute must have multiple baselines
File: /SourceCache/IBAutolayoutFoundationIOS/IDEInterfaceBuilder-6254/AutolayoutFoundation/Model/IBAutolayoutCommon.m:221
Method: CGFloat IBLayoutAttributeValueOfAttributeForItemInCoordinateSpaceOfItem(IBLayoutAttribute, NSObject<IBAutolayoutItem> *__strong, NSObject<IBAutolayoutItem> *__strong, IBUserInterfaceLayoutDirection)
UserInfo: {
IBAbstractPlatformToolExceptionBacktrace = " 0. CoreFoundation 0x000000010e8d9f1d __exceptionPreprocess\n 1. libobjc.A.dylib 0x000000010d5c0bb7 objc_exception_throw\n 2. CoreFoundation 0x000000010e8d9b79 -[NSException raise]\n 3. IBAutolayoutFoundation 0x000000010cc7cb9a IBLayoutAttributeValueOfAttributeForItemInCoordinateSpaceOfItem\n 4. IBAutolayoutFoundation 0x000000010ccaef34 -[IBLayoutConstraint roundingAdjustmentWithUserInterfaceLayoutDirection:]\n 5. IBAutolayoutFoundation 0x000000010cc8f1c3 -[IBAutolayoutEngine _attemptToAddConstraint:toView:returningConstraintsOrConstraintAbstractionsMakingSystemOverConstrained:constraintsOrAbstractionsForRepresentedConstraintsBlock:]\n 6. IBAutolayoutFoundation 0x000000010cc8f43d -[IBAutolayoutEngine attemptToAddConstraint:toView:returningConstraintsMakingSystemOverConstrained:]\n 7. IBAutolayoutFoundation 0x000000010cc63009 +[IBAutolayoutArbiter attemptToAddConstraint:byModifyingLayoutEngine:mutuallyExclusiveConstraintBreakageStrategy:mutableConstraintsToAdd:mutableConstraintsToRemove:]\n 8. IBAutolayoutFoundation 0x000000010cc8d6be -[IBAutolayoutEngine performEngineBootstrappingConstraintAdditionOperationForAddingConstraint:]\n 9. IBAutolayoutFoundation 0x000000010cc8dc44 __90-[IBAutolayoutEngine iterateViewsAndGenerateRepresentedConstraintsAndMapToRealConstraints]_block_invoke662\n 10. CoreFoundation 0x000000010e813a45 __NSDictionaryEnumerate\n 11. IBAutolayoutFoundation 0x000000010cc8d9c6 -[IBAutolayoutEngine iterateViewsAndGenerateRepresentedConstraintsAndMapToRealConstraints]\n 12. IBAutolayoutFoundation 0x000000010cc882f3 -[IBAutolayoutEngine initWithArbitrationUnit:options:]\n 13. IBAutolayoutFoundation 0x000000010cc6e818 -[IBAutolayoutArbitrationUnit computeStatus]\n 14. ??? 0x000000010b0987a5 [IBCocoaTouchTool computeAutolayoutStatusForRequest:document:]\n 15. IBFoundation 0x000000010cde08ef __80-[IBMessageReceiveChannel deliverMessage:toTarget:withArguments:context:result:]_block_invoke\n 16. IBFoundation 0x000000010cde0686 -[IBMessageReceiveChannel deliverMessage:toTarget:withArguments:context:result:]\n 17. IBFoundation 0x000000010cde0350 __88-[IBMessageReceiveChannel runBlockingReceiveLoopNotifyingQueue:notifyingTarget:context:]_block_invoke\n 18. libdispatch.dylib 0x0000000111ed5af4 _dispatch_client_callout\n 19. libdispatch.dylib 0x0000000111ec2e95 _dispatch_barrier_sync_f_slow_invoke\n 20. libdispatch.dylib 0x0000000111ed5af4 _dispatch_client_callout\n 21. libdispatch.dylib 0x0000000111ec1265 _dispatch_main_queue_callback_4CF\n 22. CoreFoundation 0x000000010e841fe9 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__\n 23. CoreFoundation 0x000000010e804eeb __CFRunLoopRun\n 24. CoreFoundation 0x000000010e804486 CFRunLoopRunSpecific\n 25. Foundation 0x000000010d17db42 -[NSRunLoop(NSRunLoop) runMode:beforeDate:]\n 26. IBFoundation 0x000000010cdbf955 -[IBAbstractPlatformTool startServingReceiveChannel:]\n 27. IBFoundation 0x000000010cdbfa2f -[IBAbstractPlatformTool startServingSocket:]\n 28. IBFoundation 0x000000010cdbfcf2 +[IBAbstractPlatformTool main]\n 29. ??? 0x000000010b0cae90 [IBViewRenderer .cxx_destruct]\n 30. libdyld.dylib 0x0000000111f06145 start";
}
Hints: None
Backtrace:
0 0x00007fff91dae654 __exceptionPreprocess (in CoreFoundation)
1 0x00000001018f7274 DVTFailureHintExceptionPreprocessor (in DVTFoundation)
2 0x00007fff9497f76e objc_exception_throw (in libobjc.A.dylib)
3 0x00007fff91dae209 -[NSException raise] (in CoreFoundation)
4 0x000000010bc8c9d9 -[IBAbstractMessageChannelToolProxy _errorByAddingAdditionalCrashInformationToError:orRaiseIfNeededOnFailure:shouldRaiseOnFailures:waitForCrashLog:] (in IDEInterfaceBuilderKit)
5 0x000000010bc8c8fd -[IBAbstractMessageChannelToolProxy errorByAddingAdditionalCrashInformationToError:orRaiseIfNeededOnFailure:] (in IDEInterfaceBuilderKit)
6 0x000000011054c06e (in IDEInterfaceBuilderCocoaTouchIntegration)
7 0x00000001105413d3 (in IDEInterfaceBuilderCocoaTouchIntegration)
8 0x000000010ba8d51d -[IBPlatformToolRequester processRequests] (in IDEInterfaceBuilderKit)
9 0x000000010192dc9c __DVTDispatchAsync_block_invoke (in DVTFoundation)
10 0x00007fff94d8d323 _dispatch_call_block_and_release (in libdispatch.dylib)
11 0x00007fff94d88c13 _dispatch_client_callout (in libdispatch.dylib)
12 0x00007fff94d8c365 _dispatch_queue_drain (in libdispatch.dylib)
13 0x00007fff94d8decc _dispatch_queue_invoke (in libdispatch.dylib)
14 0x00007fff94d8b6b7 _dispatch_root_queue_drain (in libdispatch.dylib)
15 0x00007fff94d99fe4 _dispatch_worker_thread3 (in libdispatch.dylib)
16 0x00007fff96cac637 _pthread_wqthread (in libsystem_pthread.dylib)
17 0x00007fff96caa40d start_wqthread (in libsystem_pthread.dylib)
abort() called
Application Specific Signatures:
IBAssertionFailure
Application Specific Backtrace 1:
0 CoreFoundation 0x00007fff91dae66c __exceptionPreprocess + 172
1 DVTFoundation 0x00000001018f7274 DVTFailureHintExceptionPreprocessor + 194
2 libobjc.A.dylib 0x00007fff9497f76e objc_exception_throw + 43
3 CoreFoundation 0x00007fff91dae209 -[NSException raise] + 9
4 IDEInterfaceBuilderKit 0x000000010bc8c9d9 -[IBAbstractMessageChannelToolProxy _errorByAddingAdditionalCrashInformationToError:orRaiseIfNeededOnFailure:shouldRaiseOnFailures:waitForCrashLog:] + 178
5 IDEInterfaceBuilderKit 0x000000010bc8c8fd -[IBAbstractMessageChannelToolProxy errorByAddingAdditionalCrashInformationToError:orRaiseIfNeededOnFailure:] + 98
6 IDEInterfaceBuilderCocoaTouchIntegration 0x000000011054c06e IBUISegmentConfiguration + 4812
7 IDEInterfaceBuilderCocoaTouchIntegration 0x00000001105413d3 IBIsObjectIllegalCocoaTouchOutletEndPoint + 10699
8 IDEInterfaceBuilderKit 0x000000010ba8d51d -[IBPlatformToolRequester processRequests] + 1161
9 DVTFoundation 0x000000010192dc9c __DVTDispatchAsync_block_invoke + 106
10 libdispatch.dylib 0x00007fff94d8d323 _dispatch_call_block_and_release + 12
11 libdispatch.dylib 0x00007fff94d88c13 _dispatch_client_callout + 8
12 libdispatch.dylib 0x00007fff94d8c365 _dispatch_queue_drain + 1100
13 libdispatch.dylib 0x00007fff94d8decc _dispatch_queue_invoke + 202
14 libdispatch.dylib 0x00007fff94d8b6b7 _dispatch_root_queue_drain + 463
15 libdispatch.dylib 0x00007fff94d99fe4 _dispatch_worker_thread3 + 91
16 libsystem_pthread.dylib 0x00007fff96cac637 _pthread_wqthread + 729
17 libsystem_pthread.dylib 0x00007fff96caa40d start_wqthread + 13
Thread 0:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x00007fff9730d136 __psynch_cvwait + 10
1 com.apple.Foundation 0x00007fff979cb220 -[NSCondition waitUntilDate:] + 343
2 com.apple.Foundation 0x00007fff979c10d8 -[NSConditionLock lockWhenCondition:beforeDate:] + 232
3 com.apple.dt.IBFoundation 0x00000001082c8ea6 -[IBSemaphore decrementWithTimeout:] + 179
4 com.apple.dt.IDE.IDEInterfaceBuilderKit 0x000000010ba8ccea -[IBPlatformToolRequester waitForRequestWithID:timeout:] + 352
5 com.apple.dt.IDE.IDEInterfaceBuilderKit 0x000000010bb8f6f6 -[IBDocumentAutolayoutManager autolayoutStatusForArbitrationUnitContainingObject:] + 200
6 com.apple.dt.IDE.IDEInterfaceBuilderKit 0x000000010bb903ea -[IBDocumentAutolayoutManager isItemMisplaced:] + 69
7 com.apple.dt.IDE.IDEInterfaceBuilderKit 0x000000010bb90a4b __61-[IBDocumentAutolayoutManager itemsWithCleanAutolayoutStatus]_block_invoke + 42
8 com.apple.dt.IBFoundation 0x00000001082598cd -[NSSet(IBSetAdditions) ib_setByFilteringUsingBlock:] + 246
9 com.apple.dt.IDE.IDEInterfaceBuilderKit 0x000000010bb909f0 -[IBDocumentAutolayoutManager itemsWithCleanAutolayoutStatus] + 145
10 com.apple.dt.IDE.IDEInterfaceBuilderKit 0x000000010bb829a7 -[IBDocumentAutolayoutManager preserveCleanAutolayoutStatusDuring:] + 55
11 com.apple.dt.IDE.IDEInterfaceBuilderKit 0x000000010bb6b59c -[IBDocument preserveCleanAutolayoutStatusDuring:] + 79
12 com.apple.dt.IDE.IDEInterfaceBuilderKit 0x000000010bd2c9be -[IBResourceManager synchronizeObjectPropertyValuesWithVariantContext] + 112
13 com.apple.dt.IDE.IDEInterfaceBuilderKit 0x000000010bd29de7 __66-[IBResourceManager setupVariantContextWithContainerRepositories:]_block_invoke + 870
14 com.apple.dt.IDEKit 0x0000000102ef7cac -[IDEMediaResourceVariantContext registerVariantContextObserverWithOptions:block:] + 194
15 com.apple.dt.IDE.IDEInterfaceBuilderKit 0x000000010bd299a0 -[IBResourceManager setupVariantContextWithContainerRepositories:] + 493
16 com.apple.dt.IDE.IDEInterfaceBuilderKit 0x000000010bd29f4b -[IBResourceManager setResourceProvidingContainer:] + 196
17 com.apple.dt.IDE.IDEInterfaceBuilderKit 0x000000010bb45d77 -[IBDocument setResourceProvidingContainer:] + 79
18 com.apple.dt.IDE.IDEInterfaceBuilderKit 0x000000010bb449eb -[IBDocument refreshWorkspaceSourcedContent] + 120
19 com.apple.dt.IDE.IDEInterfaceBuilderKit 0x000000010bb44cbe -[IBDocument registerWorkspaceDocument:forEditorViewController:] + 271
20 com.apple.dt.IDE.IDEInterfaceBuilderKit 0x000000010ba2fa3b -[IBAbstractDocumentEditor viewDidInstall] + 166
21 com.apple.dt.IDE.IDEInterfaceBuilderKit 0x000000010bd7ebb8 -[IBStoryboardDocumentEditor viewDidInstall] + 51
22 com.apple.dt.DVTKit 0x0000000101f4240f -[DVTViewController _didInstallContentView:] + 244
23 com.apple.dt.DVTKit 0x0000000101d458bc -[DVTControllerContentView _viewDidInstall] + 330
24 com.apple.dt.DVTKit 0x0000000101d4516c -[DVTControllerContentView viewDidMoveToWindow] + 97
25 com.apple.AppKit 0x00007fff904a0997 -[NSView _setWindow:] + 3274
26 com.apple.AppKit 0x00007fff9049dc83 -[NSView addSubview:] + 463
27 com.apple.AppKit 0x00007fff9054aea3 -[NSView setSubviews:] + 947
28 com.apple.dt.DVTKit 0x0000000101d379a1 -[DVTBorderedView setContentView:] + 193
29 com.apple.dt.IDEKit 0x0000000102928f43 -[IDEEditorContext _setEditorView] + 324
30 com.apple.dt.IDEKit 0x0000000102ae75eb -[IDEEditorContext setupNewEditor:] + 946
31 com.apple.dt.IDEKit 0x0000000102ae91f2 __91-[IDEEditorContext _openNavigableItem:documentExtension:document:shouldInstallEditorBlock:]_block_invoke + 1311
32 com.apple.dt.IDEKit 0x000000010293c01b -[IDEEditorContext _performBlockInsideReentrantGuard:] + 132
33 com.apple.dt.IDEKit 0x000000010293be6e -[IDEEditorContext _openNavigableItem:documentExtension:document:shouldInstallEditorBlock:] + 3521
34 com.apple.dt.IDEKit 0x000000010296f805 -[IDEEditorContext _openNavigableItem:withContentsOfURL:documentExtension:shouldInstallEditorBlock:] + 1713
35 com.apple.dt.IDEKit 0x0000000102aeace0 -[IDEEditorContext _notifyDelegateAndOpenNavigableItem:withContentsURL:documentExtensionIdentifier:locationToSelect:annotationRepresentedObject:stateDictionary:annotationWantsIndicatorAnimation:exploreAnnotationRepresentedObject:highlightSelection:skipSubDocumentNavigationUnlessEditorIsReplaced:] + 3652
36 com.apple.dt.IDEKit 0x0000000102aec74b -[IDEEditorContext _notifyDelegateAndOpenEditorHistoryItem:previousHistoryItemOrNil:skipSubDocumentNavigationUnlessEditorIsReplaced:] + 955
37 com.apple.dt.IDEKit 0x0000000102ae82a7 -[IDEEditorContext _openEditorHistoryItem:previousHistoryItemOrNil:skipSubDocumentNavigationUnlessEditorIsReplaced:] + 381
38 com.apple.dt.IDEKit 0x000000010296d9fe -[IDEEditorContext _openEditorHistoryItem:updateHistory:] + 346
39 com.apple.dt.IDEKit 0x000000010296cc01 -[IDEEditorContext _openEditorHistoryItemFromStateSaving:] + 448
40 com.apple.dt.IDEKit 0x00000001029a217d -[IDEEditorBasicMode _setPersistentRepresentation:forIdentifier:] + 519
41 com.apple.dt.IDEKit 0x0000000102db60be __60-[IDEEditorModeViewController _setPersistentRepresentation:]_block_invoke + 84
42 com.apple.CoreFoundation 0x00007fff91ce3536 __53-[__NSArrayI enumerateObjectsWithOptions:usingBlock:]_block_invoke + 70
43 com.apple.CoreFoundation 0x00007fff91ce3469 -[__NSArrayI enumerateObjectsWithOptions:usingBlock:] + 297
44 com.apple.dt.IDEKit 0x00000001029688ce -[IDEEditorModeViewController _setPersistentRepresentation:] + 201
45 com.apple.dt.IDEKit 0x00000001029686d1 -[IDEEditorModeViewController revertStateWithDictionary:] + 170
46 com.apple.dt.DVTFoundation 0x000000010177797b -[DVTStateToken _pullStateFromDictionary:] + 327
47 com.apple.dt.DVTFoundation 0x000000010177779d -[DVTStateToken pullStateFromRepository] + 168
48 com.apple.dt.IDEKit 0x0000000102948f18 -[IDEViewController revertState] + 48
49 com.apple.dt.IDEKit 0x0000000102922bc0 -[IDEEditorArea _updateStateSavingRegistrations] + 442
50 com.apple.dt.IDEKit 0x000000010294b48f -[IDEEditorArea _refreshEditorContextsAndPreserveCurrentEditorHistoryStack:] + 705
51 com.apple.dt.IDEKit 0x0000000102b27d0a __31-[IDEEditorArea viewDidInstall]_block_invoke + 429
52 com.apple.dt.DVTFoundation 0x00000001019081ab __73-[DVTObservingBlockToken observeValueForKeyPath:ofObject:change:context:]_block_invoke183 + 83
53 com.apple.dt.DVTFoundation 0x0000000101883d78 DVTInvokeWithStrongOwnership + 75
54 com.apple.dt.DVTFoundation 0x00000001017375fc -[DVTObservingBlockToken observeValueForKeyPath:ofObject:change:context:] + 328
55 com.apple.Foundation 0x00007fff9799aa93 NSKeyValueNotifyObserver + 382
56 com.apple.Foundation 0x00007fff97999c68 NSKeyValueDidChange + 463
57 com.apple.Foundation 0x00007fff9799e7cd -[NSObject(NSKeyValueObserverNotification) didChangeValueForKey:] + 118
58 com.apple.dt.IDEFoundation 0x0000000102335a12 __81-[IDEWorkspace _finishLoadingAsynchronously:shouldUpgradeFromSimpleFilesFocused:]_block_invoke + 321
59 com.apple.dt.IDEFoundation 0x0000000102335c6a __81-[IDEWorkspace _finishLoadingAsynchronously:shouldUpgradeFromSimpleFilesFocused:]_block_invoke321 + 59
60 com.apple.Foundation 0x00007fff97ace108 __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 7
61 com.apple.Foundation 0x00007fff979ba725 -[NSBlockOperation main] + 97
62 com.apple.Foundation 0x00007fff979993bc -[__NSOperationInternal _start:] + 653
63 com.apple.Foundation 0x00007fff97998fc3 __NSOQSchedule_f + 184
64 libdispatch.dylib 0x00007fff94d88c13 _dispatch_client_callout + 8
65 libdispatch.dylib 0x00007fff94d94cbf _dispatch_main_queue_callback_4CF + 861
66 com.apple.CoreFoundation 0x00007fff91d01c79 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
67 com.apple.CoreFoundation 0x00007fff91cbe30f __CFRunLoopRun + 2159
68 com.apple.CoreFoundation 0x00007fff91cbd858 CFRunLoopRunSpecific + 296
69 com.apple.HIToolbox 0x00007fff8fcc52df RunCurrentEventLoopInMode + 235
70 com.apple.HIToolbox 0x00007fff8fcc505a ReceiveNextEventCommon + 431
71 com.apple.HIToolbox 0x00007fff8fcc4e9b _BlockUntilNextEventMatchingListInModeWithFilter + 71
72 com.apple.AppKit 0x00007fff90488cf1 _DPSNextEvent + 964
73 com.apple.AppKit 0x00007fff904884a0 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 194
74 com.apple.dt.DVTKit 0x0000000101e5e6fd -[DVTApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 237
75 com.apple.AppKit 0x00007fff9047c463 -[NSApplication run] + 594
76 com.apple.AppKit 0x00007fff90467914 NSApplicationMain + 1832
77 libdyld.dylib 0x00007fff9496e5c9 start + 1
當我看到IB（引用的第一個屬性必須有多個基準的項目）的問題起源，我有我的故事板文件，不知道什麼嘗試和變革，這是相當大。
任何人都有同樣的命運？有任何想法嗎？