Facing this Ktor crash, anybody got some idea? I t...

# multiplatform

[Sagar Khurana]

Facing this Ktor crash, anybody got some idea? I tried multiple things, but couldnt find a solution for this

Fatal Exception: java.lang.IncompatibleClassChangeError: Found interface io.ktor.client.engine.HttpClientEngine, but class was expected (declaration of 'io.ktor.client.engine.HttpClientEngine' appears in /data/app/~~szaQlarMiLX_uT92lZNgvw==/com.foo.bar-n0F0dFVPuEeBqZslgjyDmQ==/base.apk!classes6.dex)
       at io.ktor.client.engine.HttpClientEngine.access$checkExtensions(HttpClientEngine.kt)
       at io.ktor.client.engine.HttpClientEngine$install$1.invokeSuspend(HttpClientEngine.kt:152)
       at io.ktor.client.engine.HttpClientEngine$install$1.invoke(HttpClientEngine.kt:15)
       at io.ktor.client.engine.HttpClientEngine$install$1.invoke(HttpClientEngine.kt:4)
       at io.ktor.util.pipeline.DebugPipelineContext.proceedLoop(DebugPipelineContext.kt:79)
       at io.ktor.util.pipeline.DebugPipelineContext.proceed(DebugPipelineContext.kt:54)

So far, caused 500 crashes over 90 days for 150 users

[thedroiddiv]

Are you using any other KMP library? It is possible that it might be pulling a different KTor version than what your project uses, this could result in a similar error.
Never faced myself though...

[Sagar Khurana]

Thanks @thedroiddiv 🙏 , first thing I checked.
./gradlew :app:dependencies shows every io.ktor:* on a single version (3.4.3), no 2.x/1.x mix

This client.get runs on ~every launch, but only 0.13% of sessions crash, but a real classpath conflict would be ~100%

[Sagar Khurana]

https://youtrack.jetbrains.com/issue/KTOR-9637/IncompatibleClassChangeError-Found-interface-HttpClientEngine-but-class-was-expected-release-R8-builds-Android-15-16-same-as

[Sagar Khurana]

ive also posted here