Xcode 4.6失败，退出代码为255

我正在开发iOS应用，

我今天将我的Mac操作系统从Lion升级到Mountain Lion，我在狮子座上使用 Xcode 4.6(iOS 5) .

但现在在山狮，我已经安装 Xcode 5 DP ，

现在，当我尝试在 Xocde 4.6 中运行我的应用程序时，它显示我这样的错误，

ibtoold[2032:707] [MT] DVTAssertions: ASSERTION FAILURE in /SourceCache/IDEInterfaceBuilder/IDEInterfaceBuilder-3084/Framework/Document/IBObjectContainer.m:336Details:  ID is too lowObject:   <IBObjectContainer: 0x401134c20>Method:   -setMaxID:Thread:   <NSThread: 0x40030a260>{name = (null), num = 1}Hints: NoneBacktrace:  0  0x0000000101c84ec3 -[DVTAssertionHandler handleFailureInMethod:object:fileName:lineNumber:messageFormat:arguments:] (in DVTFoundatio  1  0x0000000101c84cf4 _DVTAssertionFailureHandler (in DVTFoundatio  2  0x000000010130ffda -[IBObjectContainer setMaxID:] (in IDEInterfaceBuilderKi  3  0x0000000101298f31 -[IBDocument unarchiveDocument:] (in IDEInterfaceBuilderKi  4  0x000000010142af22 -[IBDocumentUnarchiver recurseWithElement:kind:invokingBlock:] (in IDEInterfaceBuilderKi  5  0x000000010142b0f6 -[IBDocumentUnarchiver unarchiveDocument:] (in IDEInterfaceBuilderKi  6  0x0000000101293cfb __47-[IBDocument readFromFileWrapper:ofType:error:]_block_invoke (in IDEInterfaceBuilderKi  7  0x00000001012b6ea4 -[IBDocument runBlockInNewArbitrationStackEntryWithBehavior:block:] (in IDEInterfaceBuilderKi  8  0x0000000101293b14 -[IBDocument readFromFileWrapper:ofType:error:] (in IDEInterfaceBuilderKi  9  0x0000000105232019 (in IDEInterfaceBuilderCocoaTouchIntegratio 10  0x00000001052da154 (in IDEInterfaceBuilderCocoaTouchIntegration 11  0x0000000105232094 (in IDEInterfaceBuilderCocoaTouchIntegration 12  0x00007fff97d2e527 -[NSDocument readFromURL:ofType:error:] (in AppKit 13  0x000000010128e2d1 __39-[IBDocument readFromURL:ofType:error:]_block_invoke (in IDEInterfaceBuilderKit 14  0x00000001012b0f9a -[IBDocument invokeWithUndoSuppressed:] (in IDEInterfaceBuilderKit 15  0x000000010128e08d -[IBDocument readFromURL:ofType:error:] (in IDEInterfaceBuilderKit 16  0x00000001011ab170 (in ibtoold 17  0x00000001011a750f (in ibtoold 18  0x00000001011a6792 (in ibtoold 19  0x00000001011a6640 (in ibtoold 20  0x00000001011b2f5d (in ibtoold 21  0x00000001011a61a2 (in ibtoold 22  0x00000001011aa2ad (in ibtoold 23  0x00000001011a4f74 (in ibtoold 24  0x000000000000000Command

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/ibtool failed with exit code 255

我现在应该怎么做 ？

Thanks in advance.