Unable to boot the simulator, launchd failed to respond Xcode

I downloaded Xcode 10.1 from AppStore but it had some errors at startup and couldn't show up. So I downgraded Xcode to version 10.0 (10A255) from Apple official downloads. IDE works fine but now I can't start simulator. I've tried every possible solution on the internet for hours. Here is the logs:

CoreSimulatorService[393] : com.apple.CoreSimulator.CoreSimulatorService 581.2 starting.

com.apple.ibtool[479] : Spawning processes in an unbooted state without setting kSimDeviceSpawnStandalone is deprecated.

com.apple.ibtool[478] : Spawning processes in an unbooted state without setting kSimDeviceSpawnStandalone is deprecated.

CoreSimulatorService[393] : Could not register service com.apple.PowerManagement.control: launch_sim_register_endpoint: 0xfffffecc

CoreSimulatorService[393] : Could not register service com.apple.SystemConfiguration.configd_host: launch_sim_register_endpoint: 0xfffffecc

CoreSimulatorService[393] : Could not register service com.apple.audio.coreaudiod: launch_sim_register_endpoint: 0xfffffecc

CoreSimulatorService[393] : Could not register service com.apple.SystemConfiguration.PPPController: launch_sim_register_endpoint: 0xfffffecc

CoreSimulatorService[393] : Could not register service com.apple.audio.audiohald: launch_sim_register_endpoint: 0x44e

CoreSimulatorService[393] : Could not register service com.apple.coreservices.lsuseractivity.simulatorsupport: launch_sim_register_endpoint: 0x44e

CoreSimulatorService[393] : Could not register service com.apple.SystemConfiguration.configd: launch_sim_register_endpoint: 0x44e

CoreSimulatorService[393] : Could not register service com.apple.FSEvents: launch_sim_register_endpoint: 0x44e

CoreSimulatorService[393] : Could not register service PurpleFBTVOutServer: launch_sim_register_endpoint: 0x44e

CoreSimulatorService[393] : Could not register service IndigoHIDRegistrationPort: launch_sim_register_endpoint: 0x44e

CoreSimulatorService[393] : Could not register service PurpleFBServer: launch_sim_register_endpoint: 0x44e

CoreSimulatorService[393] : Could not register service com.apple.CoreSimulator.host.bootstrap_port: launch_sim_register_endpoint: 0x44e

CoreSimulatorService[393] : Error Domain=NSPOSIXErrorDomain Code=60 "Operation timed out" UserInfo={NSLocalizedDescription=Unable to boot the Simulator., NSLocalizedFailureReason=launchd failed to respond.}

CoreSimulatorService[393] : Error Domain=NSPOSIXErrorDomain Code=60 "Operation timed out" UserInfo={NSLocalizedDescription=Unable to boot the Simulator., NSLocalizedFailureReason=launchd failed to respond.} CoreSimulatorService[393] : Error Domain=NSPOSIXErrorDomain Code=60 "Operation timed out" UserInfo={NSLocalizedDescription=Unable to boot the Simulator., NSLocalizedFailureReason=launchd failed to respond.}

What can I do?

Goto System Setting => General => Storage => 'Storage Settings' => Developer (i) icon. Delete Xcode Caches. Then try again!