Hey everybody, I am trying to add Jetpack Compose to my KMM project and specifically the Android app...

# multiplatform

[Joost Van Wynen]

Hey everybody, I am trying to add Jetpack Compose to my KMM project and specifically the Android app, however it is not cooperating. I get this error: java.lang.IncompatibleClassChangeError: Found class org.jetbrains.kotlin.ir.declarations.IrModuleFragment, but interface was expected . I think it has something to do with incompatible versions of Kotlin or some dependency, so I am trying to follow the example given by the KMM sample docs. Does anyone know which direction to look for a fix?

[nrobi]

Are you using kotlinVersion 1.4.20 with the latest 1.0.0-alpha08 compose compiler version?

composeOptions {
    kotlinCompilerVersion = "1.4.20"
    kotlinCompilerExtensionVersion = "1.0.0-alpha08"
}

[Joost Van Wynen]

Yes!

[John O'Reilly]

@Joost Van Wynen fwiw I have small KMM project that also uses Jetpack Compose (alpha08) if you want to compare setup https://github.com/joreilly/PeopleInSpace

[Joost Van Wynen]

@John O'Reilly Yes I found that, that is the sample I have been using as a reference so thanks for that! For some reason your version works perfectly and mine doesn't and I cant find any real differences in the gradle files. Anything special you had to keep in mind using Compose with KMM in comparison to a normal Kotlin Android project?

[John O'Reilly]

None that I can think of off the top of my head.

[John O'Reilly]

It does seem to point all right so some mixture of kotlin language dependencies

[Joost Van Wynen]

Ok great! Thanks for the answers and for the great and clear sample. With all the extra gradle files and configuration it is easy to miss something so I will probably restart and get that organised and sorted.

[John O'Reilly]

do you still have kotlin("android.extensions") by any chance?

[John O'Reilly]

hmm, I actually still have that as well....had thought for some reason I had had to remove it as part of moving to 1.4.20

[Joost Van Wynen]

Hmm this is really weird but removing kotlin("android.extensions") does fix my problem. My project now builds without a problem. Thanks!!

[John O'Reilly]

that's great.....will also remove it from PeopleInSpace shortly as it isn't needed anyway