安装Xcode 5后，我无法加载任何预先存在的项目。在Xcode 5中创建的任何项目都可以正常打开，但是事先创建的任何内容都会导致应用程序在加载时崩溃并显示以下崩溃报告：
Interval Since Last Report: 3191 sec
Crashes Since Last Report: 17
Per-App Interval Since Last Report: 839 sec
Per-App Crashes Since Last Report: 12
Anonymous UUID: 788D37B9-342D-C906-4E63-675844504D81
Crashed Thread: 0 Dispatch queue: IDEContainer - uniquing lock
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Application Specific Information:
ProductBuildVersion: 5A1413
ASSERTION FAILURE in /SourceCache/IDEXcode3ProjectSupport/IDEXcode3ProjectSupport- 3564.1/Xcode3Sources/XcodeIDE/Frameworks/DevToolsBase/pbxcore/MacroExpansion/XCMacroExpansionE xtensions.mm:92
Details: Assertion failed: [value isKindOfClass:[NSString class]] || [value isKindOfClass:[NSArray class]]
Object: <DVTMacroDefinitionTable: 0x7fe5f6ade810>
Method: -_xc_setValue:forMacroName:conditionSet:errorHandler:
Thread: <NSThread: 0x7fe5f2c14b80>{name = (null), num = 1}
Hints: None
Backtrace:
0 0x000000010ee69188 -[IDEAssertionHandler handleFailureInMethod:object:fileName:lineNumber:messageFormat:arguments:] (in IDEKit)
我删除了所有派生数据文件夹并禁用了内置源代码控件，但似乎没有任何影响。有谁知道如何解决这个问题？