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，但是之前创建的任何项目都会导致应用程序在加载时崩溃，并出现以下崩溃报告：
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)
我已经删除了所有派生的数据文件夹并禁用了内置的源代码管理，但似乎没有任何影响。有谁知道如何解决这个问题？