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
Mattar
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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