I created a cordova project using cordova create project hello com.hello Hello.
cordova create project hello com.hello Hello
And added iOS platform using cordova platform add iOS. And
cordova platform add iOS
I recently upgreaded to xcode 8.3.3 and ionic 3.4.0
xcode 8.3.3 and ionic 3.4.0
I have removed ios-sim directory from myApp/platforms/ios/cordova/node_modules and now it's working.