Error when runnung : cordova emulate ios --target="iPhone-X"

I tried to run

cordova emulate  ios --target="iPhone-X" 

then I get the error below. I do not know what to do. Please help

An error was encountered processing the command (domain=com.apple.CoreSimulator.SimError, code=164):
Unable to lookup in current state: Shutdown
logPath: /Users/lekan/desktop/dataluk/platforms/ios/cordova/console.log