The Xcode version is too low,does not want to update Xcode, or an early mac cannot update the latest system Download the supported Xcode version. Solution:
1. Real device package file;
2. Open terminal input a>, and then the deployment target can see the real machine version you put inYou need to restart Xcode Note: Enter the directory and put the real device package file.
open /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport
Real device package: Search online for the real device package corresponding to the test system version or copy it from the Xcode file that someone else has updated.