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I keep getting this error, whenever I try to run my app on my iphone, which is running iOS 8.1.-
The Developer Disk Image could not be mounted.
User’s iPhone may be running a version of iOS that is not supported by this version of Xcode.
I tried restarting my mac and xcode, but problem persists.
I have seen this error before in my experience. It means that the Developer Disk image in your Xcode is not compatible with the one in your iOS device that you are trying to run/develop an app with. One of the easiest way to solve this is update your Xcode installation. Another quick trick that I learned with is by copying Developer Disk image versions into Xcode.app's directory.
I earned some copies of different versions of Developer Disk image from various Macbooks that have updated and outdated Developer Disk images. You could download some resources online, extract it and then place the whole directory on your Xcode's installation directory normally located here:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/.I hope this helps!
Restarting my phone cleared this for me.
It started a day after updating to Xcode 6.1 and phone (4s) to 8.1 worked fine to start with then stopped with this message a day later.