Build succeeded Ionic 4 on Xcode but there isn't .IPA file

Hi everyone,

I’m so disturbed because I’m having too many problems with ionic 4 on Xcode making the build, now I have build succeeded but cannot find IPA file… I had to do the trick " sudo ionic cordova build ios --buildFlag="-UseModernBuildSystem=0". " but still missing the IPA file…

Thank you so much

UPDATED:

The error on Xcode is:

Code Signing Error: "MyApp" requires a provisioning profile. Select a provisioning profile for the "Release" build configuration in the project editor.
Code Signing Error: Code signing is required for product type 'Application' in SDK 'iOS 12.1'```