Question: My Xcode is telling me:

> 
> "Could not find developer disk image,"
> 
> 
> 

when I am trying to load the app onto an iPhone 6 running ios 9.2 and my Xcode is Version 7.1 (7B91b)

Answer: 
If you have iOS 9.2 on your phone, just download xcode 7.2 beta instead of using older version.

Upgraded your Xcode to 7.2 beta by downloading it from the [Xcode website](https://developer.apple.com/xcode/download/)
Older XCode version has no developer disk image for newer iOS version. If you don't want upgrade XCode you can find ready developer disk images for latest versions in this answer: <https://stackoverflow.com/a/39865199/286361>