Hi everyone, I’m trying to build a KMP project for...

# multiplatform

[Mohit Sharma]

Hi everyone, I’m trying to build a KMP project for iOS on macOS Ventura 13.7+ with Xcode 15.2 (the maximum supported on my machine).

When I open the generated iOS project from the Kotlin Multiplatform wizard, I get this error:
“The project ‘iosApp’ is damaged and cannot be opened… Exception: didn't find classname for ‘isa’ key.”

Is this related to my macOS/Xcode version being too old for the current KMP setup?

Is there a minimum macOS or Xcode version required now for building iOS targets with KMP?

Thanks in advance for any guidance.

[François]

Yes it’s related to your Xcode version,
But I can’t answer for the minimal target of Xcode.

[Mohit Sharma]

Thanks for confirming! Since I’m already on the maximum Xcode version supported by my macOS (Ventura 13.7 → Xcode 15.2), upgrading Xcode isn’t an option for me.
If KMP needs updated Xcode higher than 15.2, then I have to upgrade the machine, and that is something big for me.

[François]

FYI, Apple require to use the lastest major iOS SDK for distribution

[Subhrajyoti Sen]

There is a compatibility guide at https://kotlinlang.org/docs/multiplatform/multiplatform-compatibility-guide.html#version-compatibility

[Mohit Sharma]

Thanks, I am new to IOS, So what I have understand is like, if I want to distribute a IOS app, I still needs the latest IOS SDK for it to support all the older and latest devices.
And if I am developing the app using Kotlin Multiplatform plugin version 1.9.20 , it limits my support to iOS 17.2 only, which is supported by Xcode 15.2

[François]

That's a requirement on the AppStore just like on android build SDK property

[Mohit Sharma]

yeahh, But android never says, that you needs to update to latest OS in your computer to develop for latest compileSDK, Apple is really amazing. 🙂

Thanks for your help.