Install ionic 4 and iOS emulator failed

i have a problem with run iOS emulator on ionic studio , I select an iOS emulator iPhone 6 for example other same problem and I have this error message, an idea to resolve ?

thanks a lot !

❯ ionic cordova run ios -l --emulator --target=37DA55A1-DDEF-478D-8DF2-FE3400D9AC21 --native-run --connect – --buildFlag=’-UseModernBuildSystem=0’

ng run app:ionic-cordova-serve --host=localhost --port=8100 --platform=ios
[INFO] Waiting for connectivity with ng…

[INFO] Development server running!

   Local: http://localhost:8100
   Use Ctrl+C to quit this process

cordova build ios --emulator --target 37DA55A1-DDEF-478D-8DF2-FE3400D9AC21 --buildFlag=’-UseModernBuildSystem=0’
native-run ios --app platforms/ios/build/emulator/ --target 37DA55A1-DDEF-478D-8DF2-FE3400D9AC21 --connect --forward 8100:8100
[native-run] ERR_UNKNOWN: Unable to get app bundle identifier
[ERROR] An error occurred while running subprocess native-run.

    native-run ios --app platforms/ios/build/emulator/ --target 37DA55A1-DDEF... exited with exit code 1.
    Re-running this command with the --verbose flag may provide more information.
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