Problem with the iOS Simulator : Session could not be started

Hi everyone,
I’m on OS X Yosemite 10.10 and Xcode 6.0

When I try to emulate my application, I write ‘sudo ionic emulate ios’ and everything seems to work fine : I got ‘** BUILD SUCCEEDED **’ and the simulator starts. But the screen stays black with the error appears in the terminal :

2014-09-11 15:54:37.952 ios-sim[7980:133203] stderrPath: /Users/myName/myApp/platforms/ios/cordova/console.log
2014-09-11 15:54:37.953 ios-sim[7980:133203] stdoutPath: /Users/mynName/myApp/platforms/ios/cordova/console.log
Session could not be started: Error Domain=DTiPhoneSimulatorErrorDomain Code=2 “Simulator session timed out.” UserInfo=0x7fdba3c260e0 {NSLocalizedDescription=Simulator session timed out.}
Error: /Users/myName/myApp/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:755:16)
at Process.ChildProcess._handle.onexit (child_process.js:822:5)

Help me guys. Please. I would be very grateful.

I have the same issue.
I’m on OS X Yosemite 10.10 and Xcode 6.0, too.
Please help.