Hi, The problem occurred when you use the install Xcode from external hardisk or USB just uninstall the existing Xcode, then download clean one from https://developer.apple.com/xcode/ Hope this help you

Hi, I had the same problem, and I figured it out... The problem occurred when you use the install Xcode from external hardisk or USB just uninstall the existing Xcode, then download clean one from https://developer.apple.com/xcode/ and install it then all work fine. Hope this help you