我是Mac开发的新手。我有Lion并安装了Xcode 4.2。但是，每当我尝试单击任何.m文件时，我都会遇到崩溃。我刚刚创建了一个新项目，一旦我选择了包含.h和.m文件的文件夹，就会出现内部错误导致的崩溃。我卸载了一次并完全重新安装。仍然是同一个问题。 我基本上是Windows开发人员（.NET）。我正在尝试学习iOS App开发。 这是弹出的崩溃对话框中的错误：
内部错误 Xcode遇到内部逻辑错误。选择“继续”继续以不一致的状态运行Xcode。选择“崩溃”以暂停Xcode并使用Crash Reporter提交错误。选择“崩溃”将导致丢失所有未保存的数据。
UNCAUGHT EXCEPTION (NSInvalidArgumentException): -[__NSCFDictionary setObject:forKey:]:
attempt to insert nil value (key: SourceTree(Dev))
UserInfo: (null)
Hints: None
Backtrace:
0 0x00007fff9116926a __exceptionPreprocess (in CoreFoundation)
1 0x00007fff94a3dd5e objc_exception_throw (in libobjc.A.dylib)
2 0x00007fff911690ba +[NSException raise:format:arguments:] (in CoreFoundation)
3 0x00007fff91169044 +[NSException raise:format:] (in CoreFoundation)
4 0x00007fff9112629b -[__NSCFDictionary setObject:forKey:] (in CoreFoundation)
5 0x000000010930b5c8 -[Xcode3Group resolutionContextForStrategies:] (in DevToolsCore)
6 0x0000000105ee6785 -[IDEGroupIdentityAndType _resolutionContextForContentWithStrategies:] (in IDEKit)
7 0x0000000105ee6e24 -[IDEGroupIdentityAndType customResolutionStrategiesDisplayNamePopupItems] (in IDEKit)
8 0x00007fff897be434 _NSGetUsingKeyValueGetter (in Foundation)
9 0x00007fff897be3e9 -[NSObject(NSKeyValueCoding) valueForKey:] (in Foundation)
10 0x00007fff897dde76 -[NSObject(NSKeyValueCoding) valueForKeyPath:] (in Foundation)
11 0x0000000105e3a735 -[IDEInspectorTextEnumerationProperty rebuildMenuContent] (in IDEKit)
12 0x000000010561e028 -[DVTDelayedValidator doValidation:] (in DVTKit)
13 0x0000000105e3b14c -[IDEInspectorTextEnumerationProperty configureEnumeratedOptions] (in IDEKit)
14 0x0000000105e3b69e -[IDEInspectorTextEnumerationProperty bindAndConfigure] (in IDEKit)
15 0x0000000105e361c9 -[IDEInspectorProperty viewDidInstall] (in IDEKit)
16 0x00007fff911602e1 -[NSObject performSelector:] (in CoreFoundation)
17 0x00007fff91164722 -[NSArray makeObjectsPerformSelector:] (in CoreFoundation)
18 0x0000000105eefe8d -[IDEInspectorPropertyContainingView propertiesDidInstall] (in IDEKit)
19 0x0000000105eeffcf -[IDEInspectorPropertyContainingView viewDidMoveToWindow] (in IDEKit)
20 0x00007fff8fdf1153 -[NSView _setWindow:] (in AppKit)
21 0x00007fff8fd1d124 __NSViewRecursionHelper (in AppKit)
22 0x00007fff910f7314 CFArrayApplyFunction (in CoreFoundation)
23 0x00007fff8fdf10d7 -[NSView _setWindow:] (in AppKit)
24 0x00007fff8fd1d124 __NSViewRecursionHelper (in AppKit)
25 0x00007fff910f7314 CFArrayApplyFunction (in CoreFoundation)
26 0x00007fff8fdf10d7 -[NSView _setWindow:] (in AppKit)
27 0x00007fff8fd1d124 __NSViewRecursionHelper (in AppKit)
28 0x00007fff910f7314 CFArrayApplyFunction (in CoreFoundation)
29 0x00007fff8fdf10d7 -[NSView _setWindow:] (in AppKit)
30 0x00007fff8fd1d124 __NSViewRecursionHelper (in AppKit)
31 0x00007fff910f7314 CFArrayApplyFunction (in CoreFoundation)
32 0x00007fff8fdf10d7 -[NSView _setWindow:] (in AppKit)
33 0x00007fff8fd1d124 __NSViewRecursionHelper (in AppKit)
34 0x00007fff910f7314 CFArrayApplyFunction (in CoreFoundation)
35 0x00007fff8fdf10d7 -[NSView _setWindow:] (in AppKit)
36 0x00007fff8fdef3e2 -[NSView addSubview:] (in AppKit)
37 0x00000001088fe5b4 -[NSView(IBAppKitViewIntegration) ibSwizzledNSViewDebug_addSubview:] (in IDEInterfaceBuilderCocoaIntegration)
38 0x000000010569667d -[DVTDisclosureView layoutTopDown] (in DVTKit)
39 0x000000010560e1c3 __84+[DVTAutoLayoutView _recursivelyLayoutSubviewsOfView:populatingSetWithLaidOutViews:]_block_invoke_0 (in DVTKit)
40 0x000000010560e272 __84+[DVTAutoLayoutView _recursivelyLayoutSubviewsOfView:populatingSetWithLaidOutViews:]_block_invoke_0 (in DVTKit)
41 0x000000010560e272 __84+[DVTAutoLayoutView _recursivelyLayoutSubviewsOfView:populatingSetWithLaidOutViews:]_block_invoke_0 (in DVTKit)
42 0x000000010560e272 __84+[DVTAutoLayoutView _recursivelyLayoutSubviewsOfView:populatingSetWithLaidOutViews:]_block_invoke_0 (in DVTKit)
43 0x000000010560e272 __84+[DVTAutoLayoutView _recursivelyLayoutSubviewsOfView:populatingSetWithLaidOutViews:]_block_invoke_0 (in DVTKit)
44 0x000000010560e272 __84+[DVTAutoLayoutView _recursivelyLayoutSubviewsOfView:populatingSetWithLaidOutViews:]_block_invoke_0 (in DVTKit)
45 0x000000010560e272 __84+[DVTAutoLayoutView _recursivelyLayoutSubviewsOfView:populatingSetWithLaidOutViews:]_block_invoke_0 (in DVTKit)
46 0x000000010560e272 __84+[DVTAutoLayoutView _recursivelyLayoutSubviewsOfView:populatingSetWithLaidOutViews:]_block_invoke_0 (in DVTKit)
47 0x000000010560e272 __84+[DVTAutoLayoutView _recursivelyLayoutSubviewsOfView:populatingSetWithLaidOutViews:]_block_invoke_0 (in DVTKit)
48 0x000000010560e272 __84+[DVTAutoLayoutView _recursivelyLayoutSubviewsOfView:populatingSetWithLaidOutViews:]_block_invoke_0 (in DVTKit)
49 0x000000010560e272 __84+[DVTAutoLayoutView _recursivelyLayoutSubviewsOfView:populatingSetWithLaidOutViews:]_block_invoke_0 (in DVTKit)
50 0x000000010560e037 +[DVTAutoLayoutView _recursivelyLayoutSubviewsOfView:populatingSetWithLaidOutViews:] (in DVTKit)
51 0x000000010560dde1 -[DVTAutoLayoutView viewWillDraw] (in DVTKit)
52 0x00007fff8fd1bc11 -[NSView viewWillDraw] (in AppKit)
53 0x00007fff8fd1bc11 -[NSView viewWillDraw] (in AppKit)
54 0x00007fff8fd1bc11 -[NSView viewWillDraw] (in AppKit)
55 0x00007fff8fd1bc11 -[NSView viewWillDraw] (in AppKit)
56 0x00007fff8fd1a952 -[NSView _sendViewWillDrawInRect:clipRootView:suppressRecursion:] (in AppKit)
57 0x00007fff8fd196c1 -[NSView displayIfNeeded] (in AppKit)
58 0x00007fff8fd1907d _handleWindowNeedsDisplayOrLayoutOrUpdateConstraints (in AppKit)
59 0x00007fff91128f37 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ (in CoreFoundation)
60 0x00007fff91128e96 __CFRunLoopDoObservers (in CoreFoundation)
61 0x00007fff910fe159 __CFRunLoopRun (in CoreFoundation)
62 0x00007fff910fdae6 CFRunLoopRunSpecific (in CoreFoundation)
63 0x00007fff8d3753d3 RunCurrentEventLoopInMode (in HIToolbox)
64 0x00007fff8d37c58f ReceiveNextEventCommon (in HIToolbox)
65 0x00007fff8d37c4ca BlockUntilNextEventMatchingListInMode (in HIToolbox)
66 0x00007fff8fcdd3f1 _DPSNextEvent (in AppKit)
67 0x00007fff8fcdccf5 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] (in AppKit)
68 0x00007fff8fcd962d -[NSApplication run] (in AppKit)
69 0x00007fff8ff5880c NSApplicationMain (in AppKit)
70 0x00000001053e7eec (in Xcode)
答案 0 :(得分：2)
这听起来像是Xcode中的一个错误，而不是你负责的任何事情。
你有Xcode 4.2吗？ Xcode的当前版本是4.2.1，它可能（或可能不）包含此问题的修复程序。
如果您已经使用4.2.1，或者最新版本继续出现此行为，请通过向其问题跟踪服务提交错误报告来了解Apple：