Question on "Missing Retina 4-inch launch image" with Unity Free

Hello everyone, I'm getting a warning using Unity 4.34f1 and Xcode 5.1 about: "Missing Retina 4-inch launch image" -> "A launch image named "Default-568h@2x.png" is required to run at native resolution on Retina 4-inch devices. Would you like Xcode to add this image for you?"

My understanding is that Xcode thinks no Unity splash image is available for the the Retina 4-inch display, which confuses me because the image is listed in the correct spot, and the image does exist with the correct name (I can see it in the folder), so why would Xcode throw a warning about it? I've tried re-adding the image, but the same warning is thrown.

Any ides on why this is occurring and how to fix it would be greatly appreciated.