我正在尝试将iPhone集成到iPhone应用程序中，以便我可以在盒子上上传图像。我已经下载了示例，但它给了我错误
这是错误
错误1。
Undefined symbols for architecture i386:
"_NSURLIsExcludedFromBackupKey", referenced from:
+[BoxLocalFileGroup addSkipBackupAttributeToItemAtURL:] in Box(BoxLocalFileCache.o) ld: symbol(s) not found for architecture
i386
误差2
unable to open executable
'/Users/bcod/Library/Developer/Xcode/DerivedData/BoxSDK-gzgrgayfjmthqlgnomqiuilpvyai/Build/Products/Debug-iphonesimulator/BoxSDK.app/BoxSDK'
由于