I'm on iOS 13.5 and using Xcode 11.4 to build on to it. I'm getting this error message:
The KBlackberry is my iPhone device name.
I tried restarting the device and reconnecting of course and various other things but nothing seems to fix it. My next step is to try a newer version of Xcode.
Best Answer
Before you debug with iPhone, follow this mapping table about the version of Xcode and iOS：
Xcode 12.3 → iOS 14.3
Xcode 12.2 → iOS 14.2
Xcode 12.1 → iOS 14.1
Xcode 12 → iOS 14
Xcode 11.7 → iOS 13.7
Xcode 11.6 → iOS 13.6
Xcode 11.5 → iOS 13.5
Xcode 11.4 → iOS 13.4
Download at https://developer.apple.com/download/more/.
If you're still encountering the error, try to unpair the device within the menu Window > Devices and Simulators, clean Xcode, reconnect and trust the device, then re-run. It worked for me!
Get more info: https://en.wikipedia.org/wiki/Xcode