New to ionic - can't build for ios (9) on El Capitan

Hi, I am a student and I just started with ionic today. I have no experience with command line usage so I am pretty stumped here.

When I try to run the basic template (tabs) with:

sudo ionic platform add ios
sudo ionic build ios
sudo ionic emulate ios

(these don’t work without having the sudo there)
the last one produces this in the logs (among other stuff above):

** BUILD SUCCEEDED **

No target specified for emulator. Deploying to iPhone-6 simulator
An error was encountered processing the command (domain=com.apple.CoreSimulator.SimError, code=159):
Invalid device state
An error was encountered processing the command (domain=com.apple.CoreSimulator.SimError, code=159):
Invalid device state
ENOENT: no such file or directory, stat '/Users/Dylan/Library/Logs/CoreSimulator/D0923A6C-7738-41BA-8134-ED747069991A/system.log'
Error code 1 for command: ios-sim with args: launch,/Users/Dylan/myApp/platforms/ios/build/emulator/myApp.app,--devicetypeid,com.apple.CoreSimulator.SimDeviceType.iPhone-6,--stderr,/Users/Dylan/myApp/platforms/ios/cordova/console.log,--stdout,/Users/Dylan/myApp/platforms/ios/cordova/console.log,--exit
Error: /Users/Dylan/myApp/platforms/ios/cordova/run: Command failed with exit code 2

Is this a good place to ask for help? If so, do you have any suggestions?