Error while emulate in ios

When I ran “ionic emulate ios” but it throws following error. Build succeeded. I ran as sudo. Struck here for 2 days

** BUILD SUCCEEDED **

No target specified for emulator. Deploying to iPhone-SE, 10.2 simulator

An error was encountered processing the command (domain=com.apple.CoreSimulator.SimError, code=163):
Unable to lookup in current state: Shutdown

An error was encountered processing the command (domain=com.apple.CoreSimulator.SimError, code=163):
Unable to lookup in current state: Shutdown

Error: ENOENT: no such file or directory, stat ‘/Users/…/Library/Logs/CoreSimulator/70B7C034-2EBF-4A49-9862-C66677C27952/system.log’