为什么我打开一个项目时Xcode会崩溃？

我正在尝试使用最新版本的Xcode 5.0.2（今天更新）打开一个项目。由于某种原因，它崩溃了。我无法打开任何项目，它总是崩溃：( 崩溃报告是这样开始的（如果有帮助）：

进程：Xcode[1631]
路径：/Applications/Xcode.app/Contents/MacOS/Xcode
标识符：com.apple.dt.Xcode
版本：5.0.2（3335.32）
构建信息：IDEApplication-33350320000000000~4
应用程序项目ID:497799835
应用程序外部ID:106632651
代码类型：X86-64（本机）
父进程：已启动[133]
负责人：Xcode[1631]
用户ID:501
日期/时间：2013-11-12 18:14:14.782+0100
操作系统版本：Mac OS X 10.9（13A603）
报告版本：11
匿名UUID:041E96A2-1123-3287-3FF6-A3F30382FC69
睡眠/唤醒UUID:C6807823-3147-4602-B01F-A2A9E80B8259
崩溃线程：0调度队列：com.apple.main-Thread
异常类型：EXC_崩溃（SIGABRT）
异常代码：0x0000000000，0x0000000000000000
特定于应用程序的信息：
ProductBuildVersion:5A3005
/SourceCache/DVTFoundation/DVTFoundation-3542/Framework/Classes/FileTypes/DVTFileDataType.m:616中的断言失败
详细信息：stringRep应为非空字符串，但它为零
对象：
方法：+fileDataTypeFromStringRepresentation:
线程：{name=（null），num=1}
提示：无
回溯：
0 0x0000000102e69ea8-[IDEAssertionHandler handleFailureInMethod:对象：文件名：行号：消息格式：参数：]（在IDEKit中）
1 0x0000000101bf17a5\u DVTAssertionHandler（位于DVT地基中）
2 0x0000000101bf1ad4\u DVTAssertionFailureHandler（在DVTFoundation中）
3 0x0000000101b8ca94+[DVTFileDataType fileDataTypeFromStringRepresentation:（在DVTFoundation中）
4 0x0000000107fa5dd0-[Xcode3TargetProductFileDataType]（在DevToolsCore中）
5 0x00000001025f25ce-[IDEBuildableProductRunnableRunnableType:]（在IDEFoundation中）
6 0x00000001025ee340-[IDEProfileSchemeAction\u Update分析工具服务]（在IDEFoundation中）
7 0x0000000101c02bc8 \uuU 73-[DVTObservingBlockToken observeValueForKeyPath:ofObject:change:context:][u block\u invoke（在DVTFoundation中）
8 0x0000000101c19e88 DvTinvokewithstrongowner（在DVTFoundation中）
9 0x0000000101b58479-[DVTObservingBlockToken observeValueForKeyPath:ofObject:change:context:]（在DVTFoundation中）
10 0x00007fff90c4bc18 NSKeyValueNotifyObserver（基础中）
11 0x00007fff90c4ade8 NSKeyValueDidChange（基础中）
12 0x00007fff90c4fa56-[NSObject（NSKeyValueObserverNotification）didChangeValueForKey:（在基础中）
13 0x0000000102f6b395-[IDEContextAutocreationController可添加构建：toScheme:]（在IDEKit中）
14 0x0000000102f6bd68-[IDEContextAutocreationController CreateSchemeForBuilder:withName:]（在IDEKit中）
15 0x0000000102f6b16d-[IDEContextAutocreationController CreateDefaultSchemeForBuilder:]（在IDEKit中）
16 0x0000000102cf2976-[IDEContextAutocreationController autocreateSchemesForcingAutocreate:]（在IDEKit中）
17 0x0000000101c03618-[NSObject（DVTOBServing便利）\U dvt\U newObserverForKeyPath:选项：所有者：withHandlerBlock:（在DVTFoundation中）
18 0x0000000101b57fc5-[NSObject（DVTOBServing便利性）dvt_newObserverForKeyPath:选项：所有者：withHandlerBlock:（在DVTFoundation中）
19 0x0000000101c0326c-[NSObject（DVTOBServing便利）dvt_addObserverForKeyPath:选项：所有者：withHandlerBlock:（在DVTFoundation中）
20 0x0000000102f6a11e_u_53-[IDEContextAutocreationController initForWorkspace:][u块调用_2（在IDEKit中）
21 0x0000000101c03618-[NSObject（DVTOBServing便利）\U dvt\U newObserverForKeyPath:选项：所有者：withHandlerBlock:（在DVTFoundation中）
22 0x0000000101b57fc5-[NSObject（DVTOBServing便利性）dvt_newObserverForKeyPath:选项：所有者：withHandlerBlock:（在DVTFoundation中）
23 0x0000000101c0326c-[NSObject（DVTOBServing便利）dvt_addObserverForKeyPath:选项：所有者：withHandlerBlock:（在DVTFoundation中）
24 0x0000000102f69e8b__53-[IDEContextAutocreationController initForWorkspace:][u块_调用（在IDEKit中）
25 0x0000000101c02bc8 \uuuu 73-[DVTObservingBlockToken observeValueForKeyPath:ofObject:change:context:][u block\u invoke（在DVTFoundation中）
26 0x0000000101c19e88 DvTinvokewith Strongowner（在DVTFoundation中）
27 0x0000000101b58479-[DVTObservingBlockToken observeValueForKeyPath:ofObject:change:context:]（在DVTFoundation中）
28 0x00007fff90c4bc18 NSKeyValueNotifyObserver（基础中）
29 0x00007fff90c4ade8 NSKeyValueDidChange（基础中）
30 0x00007fff90c4fa56-[NSObject（NSKeyValueObserverNotification）didChangeValueForKey:（在基础中）
31 0x000000010268481a \uuuu 81-[IDEWorkspace\u完成同步加载：应从SimpleFileFocused:]升级\u块\u调用（在IDEFoundation中）
32 0x0000000102684ac1\uuu81-[IDEWorkspace\uFinishLoadingAsynchronously:shouldUpgradefromSimpleFileFocused:][uBlock\uInvoke281（在IDEFoundation中）
33 0x00007fff90c6b055-[NSBlockOperation main]（基础内）
34 0x00007fff90c4a591-[\u n运行内部启动：]（基础中）
35 0x00007fff90c4a23b\uuuu nsoqf（基础中）
36 0x00007fff852dc2ad调度客户端调用（在libdispatch.dylib中）
37 0x00007fff852e3f03_调度_主队列_回调_4CF（在libdispatch.dylib中）
38 0x00007fff859b9839 \uuuu CFRUNLOOP\u正在为\u主\u调度\u队列\uuu提供服务（在CoreFoundation中）
39 0x00007fff85974b14\uuu CFRunLoopRun（在CoreFoundation中）
40 0x00007fff85974275 CFRunLoopRunSpecific（在CoreFoundation中）
41 0x00007fff8bc2ef0d RunCurrentEventLoopInMode（在HIToolbox中）
42 0x00007fff8bc2ecb7 ReceiveNextEventCommon（在HIToolbox中）
43 0x00007fff8bc2eabc _块直到外部事件匹配列表InModewithFilter（在HIToolbox中）
44 0x00007fff8b0af28e_dpsnextent（在应用套件中）
45 0x00007fff8b0ae8db-[N应用程序下一个EventMachingTask:untilDate:inMode:dequeue:]（在应用程序工具包中）
46 0x00007fff8b0a29cc-[N应用程序运行]（在应用程序工具包中）
47 0x00007fff8b08d803 NSApplicationMain（在应用套件中）
48 0x00007fff899005fd启动（在libdyld.dylib中）

这类疾病最常见的原因

Process:         Xcode [1631]
Path:            /Applications/Xcode.app/Contents/MacOS/Xcode
Identifier:      com.apple.dt.Xcode
Version:         5.0.2 (3335.32)
Build Info:      IDEApplication-3335032000000000~4
App Item ID:     497799835
App External ID: 106632651
Code Type:       X86-64 (Native)
Parent Process:  launchd [133]
Responsible:     Xcode [1631]
User ID:         501

Date/Time:       2013-11-12 18:14:14.782 +0100
OS Version:      Mac OS X 10.9 (13A603)
Report Version:  11
Anonymous UUID:  041E96A2-1123-3287-3FF6-A3F30382FC69

Sleep/Wake UUID: C6807823-3147-4602-B01F-A2A9E80B8259

Crashed Thread:  0  Dispatch queue: com.apple.main-thread

Exception Type:  EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000

Application Specific Information:
ProductBuildVersion: 5A3005
ASSERTION FAILURE in /SourceCache/DVTFoundation/DVTFoundation-3542/Framework/Classes/FileTypes/DVTFileDataType.m:616
Details:  stringRep should be a non-empty string, but it is nil
Object:   <DVTFileDataType>
Method:   +fileDataTypeFromStringRepresentation:
Thread:   <NSThread: 0x7fc7d9d151c0>{name = (null), num = 1}
Hints:   None
Backtrace:
  0  0x0000000102e69ea8 -[IDEAssertionHandler handleFailureInMethod:object:fileName:lineNumber:messageFormat:arguments:] (in IDEKit)
  1  0x0000000101bf17a5 _DVTAssertionHandler (in DVTFoundation)
  2  0x0000000101bf1ad4 _DVTAssertionFailureHandler (in DVTFoundation)
  3  0x0000000101b8ca94 +[DVTFileDataType fileDataTypeFromStringRepresentation:] (in DVTFoundation)
  4  0x0000000107fa5dd0 -[Xcode3TargetProduct fileDataType] (in DevToolsCore)
  5  0x00000001025f25ce -[IDEBuildableProductRunnable runnableUTIType:] (in IDEFoundation)
  6  0x00000001025ee340 -[IDEProfileSchemeAction _updateAnalysisToolService] (in IDEFoundation)
  7  0x0000000101c02bc8 __73-[DVTObservingBlockToken observeValueForKeyPath:ofObject:change:context:]_block_invoke (in DVTFoundation)
  8  0x0000000101c19e88 DVTInvokeWithStrongOwnership (in DVTFoundation)
  9  0x0000000101b58479 -[DVTObservingBlockToken observeValueForKeyPath:ofObject:change:context:] (in DVTFoundation)
 10  0x00007fff90c4bc18 NSKeyValueNotifyObserver (in Foundation)
 11  0x00007fff90c4ade8 NSKeyValueDidChange (in Foundation)
 12  0x00007fff90c4fa56 -[NSObject(NSKeyValueObserverNotification) didChangeValueForKey:] (in Foundation)
 13  0x0000000102f6b395 -[IDEContextAutocreationController addBuildable:toScheme:] (in IDEKit)
 14  0x0000000102f6bd68 -[IDEContextAutocreationController createSchemeForBuildable:withName:] (in IDEKit)
 15  0x0000000102f6b16d -[IDEContextAutocreationController createDefaultSchemeForBuildable:] (in IDEKit)
 16  0x0000000102cf2976 -[IDEContextAutocreationController autocreateSchemesForcingAutocreate:] (in IDEKit)
 17  0x0000000101c03618 -[NSObject(DVTObservingConvenience) _dvt_newObserverForKeyPath:options:owner:withHandlerBlock:] (in DVTFoundation)
 18  0x0000000101b57fc5 -[NSObject(DVTObservingConvenience) dvt_newObserverForKeyPath:options:owner:withHandlerBlock:] (in DVTFoundation)
 19  0x0000000101c0326c -[NSObject(DVTObservingConvenience) dvt_addObserverForKeyPath:options:owner:withHandlerBlock:] (in DVTFoundation)
 20  0x0000000102f6a11e __53-[IDEContextAutocreationController initForWorkspace:]_block_invoke_2 (in IDEKit)
 21  0x0000000101c03618 -[NSObject(DVTObservingConvenience) _dvt_newObserverForKeyPath:options:owner:withHandlerBlock:] (in DVTFoundation)
 22  0x0000000101b57fc5 -[NSObject(DVTObservingConvenience) dvt_newObserverForKeyPath:options:owner:withHandlerBlock:] (in DVTFoundation)
 23  0x0000000101c0326c -[NSObject(DVTObservingConvenience) dvt_addObserverForKeyPath:options:owner:withHandlerBlock:] (in DVTFoundation)
 24  0x0000000102f69e8b __53-[IDEContextAutocreationController initForWorkspace:]_block_invoke (in IDEKit)
 25  0x0000000101c02bc8 __73-[DVTObservingBlockToken observeValueForKeyPath:ofObject:change:context:]_block_invoke (in DVTFoundation)
 26  0x0000000101c19e88 DVTInvokeWithStrongOwnership (in DVTFoundation)
 27  0x0000000101b58479 -[DVTObservingBlockToken observeValueForKeyPath:ofObject:change:context:] (in DVTFoundation)
 28  0x00007fff90c4bc18 NSKeyValueNotifyObserver (in Foundation)
 29  0x00007fff90c4ade8 NSKeyValueDidChange (in Foundation)
 30  0x00007fff90c4fa56 -[NSObject(NSKeyValueObserverNotification) didChangeValueForKey:] (in Foundation)
 31  0x000000010268481a __81-[IDEWorkspace _finishLoadingAsynchronously:shouldUpgradeFromSimpleFilesFocused:]_block_invoke (in IDEFoundation)
 32  0x0000000102684ac1 __81-[IDEWorkspace _finishLoadingAsynchronously:shouldUpgradeFromSimpleFilesFocused:]_block_invoke281 (in IDEFoundation)
 33  0x00007fff90c6b055 -[NSBlockOperation main] (in Foundation)
 34  0x00007fff90c4a591 -[__NSOperationInternal _start:] (in Foundation)
 35  0x00007fff90c4a23b __NSOQSchedule_f (in Foundation)
 36  0x00007fff852dc2ad _dispatch_client_callout (in libdispatch.dylib)
 37  0x00007fff852e3f03 _dispatch_main_queue_callback_4CF (in libdispatch.dylib)
 38  0x00007fff859b9839 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ (in CoreFoundation)
 39  0x00007fff85974b14 __CFRunLoopRun (in CoreFoundation)
 40  0x00007fff85974275 CFRunLoopRunSpecific (in CoreFoundation)
 41  0x00007fff8bc2ef0d RunCurrentEventLoopInMode (in HIToolbox)
 42  0x00007fff8bc2ecb7 ReceiveNextEventCommon (in HIToolbox)
 43  0x00007fff8bc2eabc _BlockUntilNextEventMatchingListInModeWithFilter (in HIToolbox)
 44  0x00007fff8b0af28e _DPSNextEvent (in AppKit)
 45  0x00007fff8b0ae8db -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] (in AppKit)
 46  0x00007fff8b0a29cc -[NSApplication run] (in AppKit)
 47  0x00007fff8b08d803 NSApplicationMain (in AppKit)
 48  0x00007fff899005fd start (in libdyld.dylib)