app-store - iOS:使用launchScreen.xib设置的启动界面在上传APP Store时报错(xcode7)

使用launchScreen.xib作为启动界面,但是上传到app store时报错

ERROR ITMS-90096: "Your binary is not optimized for iPhone 5 - New iPhone apps and app updates submitted must support the 4-inch display on iPhone 5 and must include a launch image referenced in the Info.plist under UILaunchImages with a UILaunchImageSize value set to {320, 568}. Launch images must be PNG files and located at the top-level of your bundle, or provided within each .lproj folder if you localize your launch images. Learn more about iPhone 5 support and app launch images by reviewing the 'iOS Human Interface Guidelines' at 'https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/MobileHIG/IconsImages/IconsImages.html#//apple_ref/doc/uid/TP40006556-CH14-SW5' and the 'iOS App Programming Guide' at 'https://developer.apple.com/library/ios/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/App-RelatedResources/App-RelatedResources.html#//apple_ref/doc/uid/TP40007072-CH6-SW12'."

以前没有遇到过这种错误,什么情况啊????