Ionic app does not work in IOS

while testing on xcode ipad simulator the app crashes at splashscreen, terminating uncaught exception of type NSException

I removed & added all plugins in ios environment but the issue remains same

This seems to be xcode 10 compatibility issue as stated here https://github.com/apache/cordova-ios/issues/407

The app runs fine on the device but not on xcode 10, testing would become nightmare if all need to depend on prod builds

There is a new build system in Xcode 10. You need to set a flag to NOT use the new build system.