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Hi,I have the same problem with my Mac 10.15 Catalina and XCode 11.1. Strange thing is once after reinstalling catalina and xcode it worked for a while and suddenly stopped booting up the simulator.After this no matter what you do simulator won't boot up.- I tried disabling SIP (csrutil disable) still the same problem- Tried to change /tmp folder permission, unable to do so. It is still the same as below lrwxr-xr-x@ 1 root admin 11 Oct 18 15:47 /tmp -> private/tmp- Deleted logs, derived data etc .. no luck- Tried with a new app -- same problem- Tried reinstalling xcode -- same problemI see below messages in console when I start simulatorOct 23 06:23:33 OHBOCMBD5GXHTD8 CoreSimulatorService[18965] <Error>: Could not register service com.apple.SystemConfiguration.configd_host: launch_sim_register_endpoint: 0xfffffeccOct 23 06:23:33 OHBOCMBD5GXHTD8 CoreSimulatorService[18965] <Error>: Could not register service com.apple.audio.coreaudiod: launch_sim_register_endpoint: 0x44eOct 23 06:23:33 OHBOCMBD5GXHTD8 CoreSimulatorService[18965] <Error>: Could not register service com.apple.SystemConfiguration.PPPController: launch_sim_register_endpoint: 0x44eOct 23 06:23:33 OHBOCMBD5GXHTD8 CoreSimulatorService[18965] <Error>: Could not register service com.apple.audio.audiohald: launch_sim_register_endpoint: 0x44eOct 23 06:23:33 OHBOCMBD5GXHTD8 CoreSimulatorService[18965] <Error>: Could not register service com.apple.coreservices.lsuseractivity.simulatorsupport: launch_sim_register_endpoint: 0x44eOct 23 06:23:33 OHBOCMBD5GXHTD8 CoreSimulatorService[18965] <Error>: Could not register service com.apple.SystemConfiguration.configd: launch_sim_register_endpoint: 0x44eOct 23 06:23:33 OHBOCMBD5GXHTD8 CoreSimulatorService[18965] <Error>: Could not register service com.apple.FSEvents: launch_sim_register_endpoint: 0x44eOct 23 06:23:33 OHBOCMBD5GXHTD8 CoreSimulatorService[18965] <Error>: Could not register service com.apple.IOSurface.Remote: launch_sim_register_endpoint: 0x44eOct 23 06:23:33 OHBOCMBD5GXHTD8 CoreSimulatorService[18965] <Error>: Could not register service IndigoHIDRegistrationPort: launch_sim_register_endpoint: 0x44eOct 23 06:23:33 OHBOCMBD5GXHTD8 CoreSimulatorService[18965] <Error>: Could not register service com.apple.CoreSimulator.SimFramebufferServer: launch_sim_register_endpoint: 0x44eOct 23 06:23:33 OHBOCMBD5GXHTD8 CoreSimulatorService[18965] <Error>: Could not register service PurpleFBServer: launch_sim_register_endpoint: 0x44eOct 23 06:23:33 OHBOCMBD5GXHTD8 CoreSimulatorService[18965] <Error>: Could not register service com.apple.metal.simulator: launch_sim_register_endpoint: 0x44eOct 23 06:23:33 OHBOCMBD5GXHTD8 CoreSimulatorService[18965] <Error>: Could not register service PurpleFBTVOutServer: launch_sim_register_endpoint: 0x44eOct 23 06:23:33 OHBOCMBD5GXHTD8 CoreSimulatorService[18965] <Error>: Could not register service com.apple.CoreSimulator.host.bootstrap_port: launch_sim_register_endpoint: 0x44eOct 23 06:23:33 OHBOCMBD5GXHTD8 CoreSimulatorService[18965] <Error>: Error Domain=NSPOSIXErrorDomain Code=60 "Operation timed out" UserInfo={NSLocalizedDescription=Unable to boot the Simulator., NSLocalizedFailureReason=launchd failed to respond.}Oct 23 06:23:33 OHBOCMBD5GXHTD8 CoreSimulatorService[18965] <Error>: Error Domain=NSPOSIXErrorDomain Code=60 "Operation timed out" UserInfo={NSLocalizedDescription=Unable to boot the Simulator., NSLocalizedFailureReason=launchd failed to respond.}Oct 23 06:23:33 OHBOCMBD5GXHTD8 CoreSimulatorService[18965] <Error>: Error Domain=NSPOSIXErrorDomain Code=60 "Operation timed out" UserInfo={NSLocalizedDescription=Unable to boot the Simulator., NSLocalizedFailureReason=launchd failed to respond.}Oct 23 06:23:33 OHBOCMBD5GXHTD8 com.apple.dt.Xcode[18959] <Error>: Error Domain=NSPOSIXErrorDomain Code=60 "Operation timed out" UserInfo={NSLocalizedFailureReason=launchd failed to respond., NSLocalizedDescription=Unable to boot the Simulator.}Oct 23 06:23:33 OHBOCMBD5GXHTD8 CoreSimulatorService[18965] <Error>: Error Domain=com.apple.CoreSimulator.SimError Code=165 "Unable to lookup in current state: Shutdown" UserInfo={NSLocalizedDescription=Unable to lookup in current state: Shutdown}Oct 23 06:23:33 OHBOCMBD5GXHTD8 CoreSimulatorService[18965] <Error>: Error Domain=com.apple.CoreSimulator.SimError Code=165 "Unable to lookup in current state: Shutdown" UserInfo={NSLocalizedDescription=Unable to lookup in current state: Shutdown}Oct 23 06:23:33 OHBOCMBD5GXHTD8 CoreSimulatorService[18965] <Error>: Error looking up host support port: Error Domain=com.apple.CoreSimulator.SimError Code=165 "Unable to lookup in current state: Shutdown" UserInfo={NSLocalizedDescription=Unable to lookup in current state: Shutdown}Oct 23 06:23:33 OHBOCMBD5GXHTD8 CoreSimulatorService[18965] <Error>: Error Domain=com.apple.CoreSimulator.SimError Code=165 "Unable to lookup in current state: Shutdown" UserInfo={NSLocalizedDescription=Unable to lookup in current state: Shutdown}Oct 23 06:23:33 OHBOCMBD5GXHTD8 CoreSimulatorService[18965] <Error>: Failed to notify_get_state: com.apple.system.thermalpressurelevel 2Can any one pls help?