This iPad mini 2 (Model A1490) is running iOS 10.3 (14E277), which may not be supported by this version of Xcode.
my xcode version 8.2.1 my Device ios version 10.2>
In order to run your app on 10.3 device with Xcode 8.2.1 you'll need a new Developer Disk Image for 10.3.
You can follow this user's guide here that seems is working for me too. Use at your own risk.
Steps:
1.Download Zip file and extract.
2.Click on "Finder" in MAC OS
3.Click on "Go to Folder"
4.Paste /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport . Otherwise go to Applications > Right Click on Xcode > Show Package Contents and follow the directories above.
5.You'll notice that your versions ends at 10.2. So you need the new 10.3. Paste downloaded folder.
6.Reboot Device + Xcode + Mac