Usage of '--family' is deprecated in 3.x. Use --devicetypeid instead

I am new to ionic framework. I followed the official getting started. Everything is fine except when i run

ionic emulate ios

the red color console warning as below:

2014-11-10 10:02:23.837 ios-sim[9436:507] 
  stderrPath: /Users/apple/Projects/nodejs/ionic/tean/platforms/ios/cordova/console.log
2014-11-10 10:02:23.838 ios-sim[9436:507]
  stdoutPath: /Users/apple/Projects/nodejs/ionic/tean/platforms/ios/cordova/console.log
Usage of '--family' is deprecated in 3.x. Use --devicetypeid instead.
Usage of '--retina' is deprecated in 3.x. Use --devicetypeid instead.
Session could not be started: Error Domain=DTiPhoneSimulatorErrorDomain Code=2 "Simulator session timed out." UserInfo=0x7ff47ab00790 {NSLocalizedDescription=Simulator session timed out.}

Error: /Users/apple/Projects/nodejs/ionic/tean/platforms/ios/cordova/run: Command failed with exit code 1
at ChildProcess.whenDone (/usr/local/lib/node_modules/cordova/node_modules/cordova-lib/src/cordova/superspawn.js:135:23)
at ChildProcess.emit (events.js:98:17)
at maybeClose (child_process.js:756:16)
at Process.ChildProcess._handle.onexit (child_process.js:823:5)

Even with this error the ios emulator open and run without any problem. is there any solution to get ride of this ?

ps: I also tried with:

ionic emulate --devicetypeid=retina
ionic emulate --devicetypeid=retina
ionic emulate --retina

the problem still persisted