Xcode CoreFoundation/CFUserNotification.h' file not found

I don’t know why I get this, when I build a iPad project in xcode4.6.
iOS sdk 6.1, simulator 6.1.


/Applications/Xcode4.6.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.1.sdk/System/Library/Frameworks/CoreFoundation.framework/Headers/CoreFoundation.h:92:10: 'CoreFoundation/CFUserNotification.h' file not found
In file included from /Applications/Xcode4.6.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.1.sdk/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:5:10

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