Can't run iPhone simulator - file "Logs" couldn't be saved
Try to reset the Ios Simulator settings it worked for me!
iOS Simulator -> Reset Content and Settings...
I suspect that you manually deleted ~/Library/Logs/CoreSimulator and the error message is because the sim is failing to create the ~/Library/Developer/CoreSimulator/Devices//data/Library/Logs symlink because it already exists.
You should be able to get out of this situation by resetting the device by running 'xcrun simctl erase [udid]'