我在同一台Macbook中有Xcode 6.4和Xcode 7，但后来我将Xcode 7更新为7.1，现在我无法打开Xcode 6.4版本。
Process: Xcode [13139]
Path: /Applications/Xcode 6.app/Contents/MacOS/Xcode
Identifier: com.apple.dt.Xcode
Version: 6.4 (7720)
Build Info: IDEFrameworks-7720000000000000~8
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: Xcode [13139]
User ID: 502
PlugIn Path: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/macosx/libswiftCore.dylib
PlugIn Identifier: libswiftCore.dylib
PlugIn Version: 2.1 (700.1.101.6)
Date/Time: 2015-10-23 10:51:23.902 -0200
OS Version: Mac OS X 10.10.5 (14F1021)
Report Version: 11
Anonymous UUID: 3C65E0B9-2018-8B23-3825-C5EB4D6161BE
Sleep/Wake UUID: 79EE1FEB-DB8C-44E2-9C3B-F7C7B6C44EB5
Time Awake Since Boot: 19000 seconds
Time Since Wake: 6900 seconds
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: EXC_I386_GPFLT
Application Specific Information:
ProductBuildVersion: 6E35b
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libsystem_c.dylib 0x00007fff851dafb2 strlen + 18
1 libswiftCore.dylib 0x0000000119247aac _buildDemanglingForNominalType(swift::Demangle::Node::Kind, swift::Metadata const*, swift::NominalTypeDescriptor const*) + 44
2 libswiftCore.dylib 0x0000000119245cc5 _buildDemanglingForMetadata(swift::Metadata const*) + 133
3 libswiftCore.dylib 0x0000000119247b7c _buildDemanglingForNominalType(swift::Demangle::Node::Kind, swift::Metadata const*, swift::NominalTypeDescriptor const*) + 252
4 libswiftCore.dylib 0x0000000119245cc5 _buildDemanglingForMetadata(swift::Metadata const*) + 133
5 libswiftCore.dylib 0x00000001192459bc swift_getGenericClassObjCName + 28
6 libswiftCore.dylib 0x00000001191975dd 0x118ffe000 + 1676765
7 libswiftCore.dylib 0x000000011923bdd8 (anonymous namespace)::GenericCacheEntry* llvm::function_ref<(anonymous namespace)::GenericCacheEntry* ()>::callback_fn<swift::swift_getGenericMetadata::$_0>(long) + 24
8 libswiftCore.dylib 0x000000011923bce0 swift::MetadataCache<(anonymous namespace)::GenericCacheEntry>::addMetadataEntry(swift::EntryRef<(anonymous namespace)::GenericCacheEntry>, ConcurrentList<swift::MetadataCache<(anonymous namespace)::GenericCacheEntry>::EntryPair>&, llvm::function_ref<(anonymous namespace)::GenericCacheEntry* ()>) + 128
9 libswiftCore.dylib 0x0000000119238488 swift_getGenericMetadata + 504
10 libswiftCore.dylib 0x000000011923851d swift_getGenericMetadata3 + 29
11 libswiftFoundation.dylib 0x0000000119519226 _TZFe0_Rq_Ss8Hashable_10FoundationVSs10Dictionary26_forceBridgeFromObjectiveCu0_Rq_S__fMGS1_q_q0__FTCSo12NSDictionary6resultRGSqGS1_q_q0____T_ + 54
12 libswiftFoundation.dylib 0x00000001195190ed _TF10Foundation32_convertNSDictionaryToDictionaryu0_Rq_Ss8Hashable_FGSqCSo12NSDictionary_GVSs10Dictionaryq_q0__ + 61
13 ca.nri.ColorSenseRainbow 0x0000000118dce1ad _TTSf4g_n___TZFC17ColorSenseRainbow17ColorSenseRainbow13pluginDidLoadfMS0_FCSo8NSBundleT_ + 189 (ColorSenseRainbow.swift:33)
14 ca.nri.ColorSenseRainbow 0x0000000118dcc6f5 _TToZFC17ColorSenseRainbow17ColorSenseRainbow13pluginDidLoadfMS0_FCSo8NSBundleT_ + 37
15 com.apple.Xcode.DevToolsCore 0x0000000118530075 __46-[XCPluginManager loadPluginBundle:forDomain:]_block_invoke + 147
16 com.apple.dt.DVTFoundation 0x000000010e5ff972 DVTInvokeWithFailureHint + 83
17 com.apple.Xcode.DevToolsCore 0x000000011852fd9c -[XCPluginManager loadPluginBundle:forDomain:] + 1041
18 com.apple.Xcode.DevToolsCore 0x000000011852f831 __46-[XCPluginManager findAndLoadPluginsInDomain:]_block_invoke + 621
19 com.apple.dt.DVTFoundation 0x000000010e5e689d -[DVTPlugInManager _allowNonApplePlugInsFromDescriptors:error:] + 476
20 com.apple.dt.DVTFoundation 0x000000010e5e6b1e -[DVTPlugInManager _checkNonApplePlugIns] + 239
21 com.apple.dt.DVTFoundation 0x000000010e5e6b94 -[DVTPlugInManager initializePlugIns:] + 27
22 com.apple.dt.IDEFoundation 0x000000010f081634 _IDEInitializeOtherPlugInStuff + 175
23 com.apple.dt.IDEFoundation 0x000000010f082a0c IDEInitialize + 3533
24 com.apple.dt.IDEKit 0x000000010f667bdc -[IDEApplicationController applicationWillFinishLaunching:] + 710
25 com.apple.CoreFoundation 0x00007fff87c2e45c __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12
26 com.apple.CoreFoundation 0x00007fff87b1e634 _CFXNotificationPost + 3140
27 com.apple.Foundation 0x00007fff90092aa1 -[NSNotificationCenter postNotificationName:object:userInfo:] + 66
28 com.apple.dt.DVTFoundation 0x000000010e5db998 -[NSNotificationCenter(DVTNSNotificationCenterAdditions) _dvt_postNotificationName:object:userInfo:] + 162
29 com.apple.AppKit 0x00007fff83229e57 -[NSApplication finishLaunching] + 440
30 com.apple.dt.DVTKit 0x000000010eb7f952 -[DVTApplication finishLaunching] + 149
31 com.apple.AppKit 0x00007fff83229921 -[NSApplication run] + 128
32 com.apple.AppKit 0x00007fff831a6244 NSApplicationMain + 1832
33 libdyld.dylib 0x00007fff8fe005c9 start + 1
Thread 1:: Dispatch queue: com.apple.libdispatch-manager
0 libsystem_kernel.dylib 0x00007fff8c9c7232 kevent64 + 10
1 libdispatch.dylib 0x00007fff822cd26e _dispatch_mgr_thread + 52
Thread 2:
0 libsystem_kernel.dylib 0x00007fff8c9c694a __workq_kernreturn + 10
1 libsystem_pthread.dylib 0x00007fff8af043dd start_wqthread + 13
Thread 3:
0 libsystem_kernel.dylib 0x00007fff8c9c694a __workq_kernreturn + 10
1 libsystem_pthread.dylib 0x00007fff8af043dd start_wqthread + 13
Thread 4:
0 libsystem_kernel.dylib 0x00007fff8c9c694a __workq_kernreturn + 10
1 libsystem_pthread.dylib 0x00007fff8af043dd start_wqthread + 13
Thread 5:
0 libsystem_kernel.dylib 0x00007fff8c9c694a __workq_kernreturn + 10
1 libsystem_pthread.dylib 0x00007fff8af043dd start_wqthread + 13
Thread 0 crashed with X86 Thread State (64-bit):
rax: 0x0000000119245c87 rbx: 0xc9854800101ab30d rcx: 0xc9854800101ab30d rdx: 0xc9854800101ab30d
rdi: 0xc9854800101ab300 rsi: 0x0000000000000007 rbp: 0x00007fff517d81e0 rsp: 0x00007fff517d81e0
r8: 0x0000000000000001 r9: 0x00000000fffffff0 r10: 0x0000000000000002 r11: 0x00007fe83d300000
r12: 0x0000000119284f20 r13: 0x000000011919c970 r14: 0x0000000000000007 r15: 0x00007fff517d85d0
rip: 0x00007fff851dafb2 rfl: 0x0000000000010286 cr2: 0x000000011919c978
Logical CPU: 0
Error Code: 0x00000000
Trap Number: 13
答案 0 :(得分：8)
需要从此目录中删除一个或多个插件：
〜/ Library / Application Support / Developer / Shared / Xcode / Plug-ins /
要修复：
打开上面提到的目录，暂时删除一个或多个找到的插件。
注意：
在终端中以非sudo用户身份运行以下命令将显示影响启动的插件：
open /Applications/Xcode.app/Contents/MacOS/Xcode
在终端
中运行代码后产生的示例错误2015-10-01 09:04:07.052 Xcode[860:42364] [MT] PluginLoading: Required plug-in compatibility UUID 0420B86A-AA43-4792-9ED0-6FE0F2B16A13 for plug-in at path '~/Library/Application Support/Developer/Shared/Xcode/Plug-ins/SwiftCodeSnippets.xcplugin' not present in DVTPlugInCompatibilityUUIDs
2015-10-01 09:04:07.054 Xcode[860:42364] [MT] PluginLoading: Required plug-in compatibility UUID 0420B86A-AA43-4792-9ED0-6FE0F2B16A13 for plug-in at path '~/Library/Application Support/Developer/Shared/Xcode/Plug-ins/CocoaControlsPlugin.xcplugin' not present in DVTPlugInCompatibilityUUIDs
2015-10-01 09:04:07.054 Xcode[860:42364] [MT] PluginLoading: Required plug-in compatibility UUID 0420B86A-AA43-4792-9ED0-6FE0F2B16A13 for plug-in at path '~/Library/Application Support/Developer/Shared/Xcode/Plug-ins/BBUUtilitiesTuckAway.xcplugin' not present in DVTPlugInCompatibilityUUIDs
Segmentation fault: 11
答案 1 :(得分：1)
通过重新启动我的Mac ，我的 Xcode 7.2.1 修复了类似的问题。
答案 2 :(得分：1)
我遇到了同样的问题，我的解决方法是删除Xcode派生数据目录中的所有子文件夹。 Xcode自动重建。
答案 3 :(得分：0)
我通过删除 libMainThreadChecker.dylib 文件解决了这个问题：
rm -r /Applications/Xcode.app/Contents/Developer/usr/lib/libMainThreadChecker.dylib