This is certainly not the best solution, but I managed to start everything again by uninstalling Xcode, rebooting, processing Xcode 6.4, and rebooting time.
I think you could leave with Time Machining, so I don’t think you need to remove Xcode and reboot before handling the time. Just share the rounds of steps I took.
If I find the best answer, I will try to remember here.
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