Class 'androidx.navigation.compose.NavHostControllerKt' is compiled by an unstable version of the Kotlin compiler and cannot be loaded by this compiler

I updated to

alpha12

and getting error , any reasons?

Did you upgrade to Navigation Compose 1.0.0-alpha07? That's the only version compatible with alpha12 as per the release notes: https://developer.android.com/jetpack/androidx/releases/navigation#compose-1.0.0-alpha07

I didn't, thank you

The releases page has an RSS feed that updates anytime any artifact is released, that would tell you what has a new version available: https://developer.android.com/jetpack/androidx/versions/all-channel

thank you