我会犯这样的错误:
2014-10-16 13:14:50.996 xcodebuild[6775:1007] [MT] iPhoneSimulator: Unable to connect to "com.apple.instruments.deviceservice.lockdown" (Error Domain=com.apple.CoreSimulator.SimError Code=146 "Unable to lookup in current state: Shutdown" UserInfo=0x7fabd4043b30 {NSLocalized