[UE 5.4 iOS] Unknown Cook Failure During Packaging – App Store Also Requires iOS 18 SDK

Hello,

Thank you for your response. I’ve already tried deleting the Saved and Intermediate folders and regenerating the project files, but unfortunately the issue still persists.

I also tested with a completely clean project using Unreal Engine 5.6, and the same error occurs. I even opened the project in Visual Studio to check for any compile-time errors, but nothing obvious showed up.

Additionally, I’ve updated Unreal Engine to the latest available 5.6 version before performing these tests.

I’ve attached the cook log file for your reference — please take a look and let me know if you notice anything unusual.

Thanks again for your support.

Cook-2025.06.06-17.50.39.txt (72.1 KB)