I Have an iPhone 4 running IOS 7.1.2, since the Xcode-Beta doesn't Support anything lower than iOS 8, I referred to this Answer on Stack : Any way to install app to iPhone 4 with Xcode 8 beta?
So I Followed The Steps, then I made a new Project Connected My iPhone But I get this error: The Error Image
Keep In mind that it is a stock project. I didn't change anything except the Minimum Deployment version.