Jetpack Compose: Backend Internal error when calling function with lambda from Coroutine

user_793861 0
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Sort of strange one but was getting "Backend Internal error" error when using Jetpack Compose and turned out it was triggered by calling a function that takes a lambda from within a Coroutine.

It's pretty easy to reproduce....have narrowed it down to following steps:

Create new project using "Empty Compose Activity" template. Update to dev07 (had issue with previous versions as well) and also add following to build.gradle

composeOptions {
    kotlinCompilerExtensionVersion = "0.1.0-dev07"
}

Add following to MyActivity.kt

fun someFun(success: (String) -> Unit) {
}

and then update onCreate to following:

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)

    lifecycleScope.launch {
        someFun {
        }
    }
    setContent {
        MaterialTheme {
            Greeting("Android")
        }
    }
}

Build project and then you see following error:

e: java.lang.IllegalStateException: Backend Internal error: Exception during code generation
Element is unknownThe root cause java.lang.RuntimeException was thrown at: org.jetbrains.kotlin.backend.jvm.codegen.FunctionCodegen.generate(FunctionCodegen.kt:42)
    at org.jetbrains.kotlin.codegen.CompilationErrorHandler.lambda$static$0(CompilationErrorHandler.java:35)
    at org.jetbrains.kotlin.backend.jvm.JvmBackendFacade.doGenerateFilesInternal$backend_jvm(JvmBackendFacade.kt:114)

Note you also need to add following dependency to build.gradle

implementation "androidx.lifecycle:lifecycle-runtime-ktx:2.2.0"
android-jetpack-compose android
2 Answers

Make sure to add this to every module you use compose in

buildFeatures {
    compose true
}

This was a comment by alashow and the only thing that worked.

user_118395300

Make sure that you have added compose to your Gradle inside android {...} block. You have to do it for every module that uses compose. Refer following to add the compose:

buildFeatures {
    compose = true
}

composeOptions {
    kotlinCompilerExtensionVersion compose_version
}
user_74677560
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