There has two way to fix this problem:
Step One: Edit Scheme => Run => Options => uncheck Debug xpc services used by app
if step one did not work, then try step two.
Step Two: Deleting the files in $HOME/Library/Developer/Xcode/iOS DeviceSupport and Device Logs, then relaunch your Xcode.
if step two still not work, ok find way from other's.
Good luck.
xuqiang.apple
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