DTDeviceKit: deviceType from <UDID> was NULL

I am a newbie on Mac and iOS testing.
I have followed all the instructions in this website https://github.com/appium/appium-xcuitest-driver/blob/master/docs/real-device-config.md
Prior to this I have also installed Homebrew, NodeJS, libimobiledevice --HEAD, ideviceinstaller, carthage, ios-deploy
I have also install appium-xcuitest-driver for WebDriverAgentRunner.
I have followed the full manual configuration which included building the WebDriverAgent.xcodeproj in Xcode, and in Terminal

It was built successfully in Xcode, but not in the terminal. What could be the issue here?

This has been resolved. Had to reset my devices…

Man, IOS is a PAIN!

@marjorie_moreno what exactly do you mean with “reset my devices” ?