You need a development provisioning profile on your build machine. Apps can run on the simulator without a profile, but they are required to run on an actual device.
If you open the project in Xcode, it may automatically set up provisioning for you. Otherwise you will have to create go to the iOS Dev Center and create a profile.

You need a development provisioning profile on your build machine. Apps can run on the simulator without a profile, but they are required to run on an actual device.
If you open the project in Xcode, it may automatically set up provisioning for you. Otherwise you will have to create go to the iOS Dev Center and create a profile.
https://stackoverflow.com/questions/34166175/cordova-run-with-ios-error-error-code-65-for-command-xcodebuild-with-args/39875191
Same question here by this guy Try to sign in as ios dev account in Xcode
or try
ionic platform remove ios
ionic platform add ios
i was getting the same error but i tried the above command and its working now thanks