fix ionic4 project errors in ios platform

this is a 1 day job(few hours) this should be easy job for ionic expert developer. please do not submit unless you are expert in ionic/iOS platform. I have an ionic project that builds successfully with : ionic cordova build ios also build successfully in xcode however, when run in iOS simulator, the following errors show up in the console: -Failed to load webpage with error: the operation couldnt be completed(NSURLErrorDomain error -999) -NSURL Connection finished with error -code -1100 -ERROR: HTTP Request(OSRequestRegisterUser) must contain an app_id parameter -ERROR: Encountered error during push registration with OneSignal in addition to the above errors, the iOS simulator hangs on "White Screen", the application does not load and nothing happens next. I believe there will no need for code modifications since the application is already up and running normally on android(it is actually live on google play store). These issues only occur on iOS This should be easy job(few hours) for an experienced developer who already worked with ionic4 on the latest xcode version. I am a developer myself but I do not work with iOS. So, the way to complete this project is that I will provide you remote access using AnyDesk/Teamviewer/Whatever... and you will be able to work directly on the mac with all files opened and ready for you. I will guide you and assist you through the process. Appreciate you help. Please only serious and experienced developers.