Internal compiler error while using latest kotlinx-serialization-core:1.0.0-RC

[khushwaqt]

Describe the bug I am trying to use kotlin serizlization in my android application, but as soon as I mark my data class with @Serializable the project stops compiling with internal compiler error. I have double checked every thing, and i ma quite sure that I haven`t miss any thing. I have added this to my build.gradle project file inside dependencies

 dependencies {
   // others
        classpath "org.jetbrains.kotlin:kotlin-serialization:$kotlin_version"
    }

while in build.grade module i have

dependencies {
org.jetbrains.kotlinx:kotlinx-serialization-core:1.0.0-RC
}

Here are my plugins at top apply plugin: 'com.android.application' apply plugin: 'kotlin-android' apply plugin: "androidx.navigation.safeargs.kotlin" apply plugin: 'kotlin-kapt' apply plugin: 'kotlinx-serialization'

I simply used the data class from sample provided in readme like this To Reproduce[ @Serializable data class Project(val name: String, val language: String)

here is stackstace```

Task :app:preBuild UP-TO-DATE

Task :app:preDebugBuild UP-TO-DATE Task :app:compileDebugAidl NO-SOURCE Task :app:generateDebugBuildConfig UP-TO-DATE Task :app:writeDebugApplicationId UP-TO-DATE Task :app:generateSafeArgsDebug UP-TO-DATE Task :app:compileDebugRenderscript NO-SOURCE Task :app:prepareLintJar UP-TO-DATE Task :app:prepareLintJarForPublish UP-TO-DATE Task :app:generateDebugSources UP-TO-DATE Task :app:dataBindingExportBuildInfoDebug UP-TO-DATE Task :app:dataBindingMergeDependencyArtifactsDebug UP-TO-DATE Task :app:dataBindingMergeGenClassesDebug UP-TO-DATE Task :app:generateDebugResValues UP-TO-DATE Task :app:generateDebugResources UP-TO-DATE Task :app:mergeDebugResources UP-TO-DATE Task :app:dataBindingGenBaseClassesDebug UP-TO-DATE Task :app:dataBindingExportFeaturePackageIdsDebug UP-TO-DATE Task :app:createDebugCompatibleScreenManifests UP-TO-DATE Task :app:extractDeepLinksDebug UP-TO-DATE Task :app:processDebugManifest UP-TO-DATE Task :app:processDebugResources UP-TO-DATE

Task :app:kaptGenerateStubsDebugKotlin FAILED e: kotlin.KotlinNullPointerException at org.jetbrains.kotlinx.serialization.compiler.resolve.SearchUtilsKt.getKSerializerConstructorMarker(SearchUtils.kt:64) at org.jetbrains.kotlinx.serialization.compiler.resolve.KSerializerDescriptorResolver.createLoadConstructorDescriptor(KSerializerDescriptorResolver.kt:317) at org.jetbrains.kotlinx.serialization.compiler.extensions.SerializationResolveExtension.generateSyntheticSecondaryConstructors(SerializationResolveExtension.kt:86) at org.jetbrains.kotlin.resolve.lazy.descriptors.LazyClassMemberScope.addSyntheticSecondaryConstructors(LazyClassMemberScope.kt:442) at org.jetbrains.kotlin.resolve.lazy.descriptors.LazyClassMemberScope.doGetConstructors(LazyClassMemberScope.kt:437) at org.jetbrains.kotlin.resolve.lazy.descriptors.LazyClassMemberScope.access$doGetConstructors(LazyClassMemberScope.kt:49) at org.jetbrains.kotlin.resolve.lazy.descriptors.LazyClassMemberScope$secondaryConstructors$1.invoke(LazyClassMemberScope.kt:432) at org.jetbrains.kotlin.resolve.lazy.descriptors.LazyClassMemberScope$secondaryConstructors$1.invoke(LazyClassMemberScope.kt:49) at org.jetbrains.kotlin.storage.LockBasedStorageManager$LockBasedLazyValue.invoke(LockBasedStorageManager.java:355) at org.jetbrains.kotlin.storage.LockBasedStorageManager$LockBasedNotNullLazyValue.invoke(LockBasedStorageManager.java:474) at org.jetbrains.kotlin.resolve.lazy.descriptors.LazyClassMemberScope.getConstructors(LazyClassMemberScope.kt:446) at org.jetbrains.kotlin.resolve.lazy.descriptors.LazyClassDescriptor.getConstructors(LazyClassDescriptor.java:402) at org.jetbrains.kotlin.resolve.lazy.descriptors.LazyClassDescriptor.resolveMemberHeaders(LazyClassDescriptor.java:586) at org.jetbrains.kotlin.resolve.lazy.descriptors.LazyClassDescriptor.doForceResolveAllContents(LazyClassDescriptor.java:565) at org.jetbrains.kotlin.resolve.lazy.descriptors.LazyClassDescriptor.lambda$new$4(LazyClassDescriptor.java:216) at org.jetbrains.kotlin.storage.LockBasedStorageManager$LockBasedLazyValue.invoke(LockBasedStorageManager.java:355) at org.jetbrains.kotlin.resolve.lazy.descriptors.LazyClassDescriptor.forceResolveAllContents(LazyClassDescriptor.java:561) at org.jetbrains.kotlin.resolve.lazy.ForceResolveUtil.doForceResolveAllContents(ForceResolveUtil.java:78) at org.jetbrains.kotlin.resolve.lazy.ForceResolveUtil.forceResolveAllContents(ForceResolveUtil.java:42) at org.jetbrains.kotlin.resolve.jvm.extensions.PartialAnalysisHandlerExtension$doAnalysis$1.invoke(PartialAnalysisHandlerExtension.kt:68) at org.jetbrains.kotlin.resolve.jvm.extensions.PartialAnalysisHandlerExtension$doAnalysis$1.invoke(PartialAnalysisHandlerExtension.kt:34) at org.jetbrains.kotlin.resolve.jvm.extensions.PartialAnalysisHandlerExtension.doForEachDeclaration(PartialAnalysisHandlerExtension.kt:121) at org.jetbrains.kotlin.resolve.jvm.extensions.PartialAnalysisHandlerExtension.doForEachDeclaration(PartialAnalysisHandlerExtension.kt:135) at org.jetbrains.kotlin.resolve.jvm.extensions.PartialAnalysisHandlerExtension.doAnalysis(PartialAnalysisHandlerExtension.kt:63) at org.jetbrains.kotlin.kapt3.AbstractKapt3Extension.doAnalysis(Kapt3Extension.kt:147) at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration(TopDownAnalyzerFacadeForJVM.kt:105) at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration$default(TopDownAnalyzerFacadeForJVM.kt:82) at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler$analyze$1.invoke(KotlinToJVMBytecodeCompiler.kt:554) at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler$analyze$1.invoke(KotlinToJVMBytecodeCompiler.kt:81) at org.jetbrains.kotlin.cli.common.messages.AnalyzerWithCompilerReport.analyzeAndReport(AnalyzerWithCompilerReport.kt:107) at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.analyze(KotlinToJVMBytecodeCompiler.kt:545) at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileModules$cli(KotlinToJVMBytecodeCompiler.kt:176) at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:163) at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:51) at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:85) at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:43) at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:105) at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:349) at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:105) at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileIncrementally(IncrementalCompilerRunner.kt:237) at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:88) at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:606) at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:99) at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1645) at sun.reflect.GeneratedMethodAccessor98.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357) at sun.rmi.transport.Transport$1.run(Transport.java:200) at sun.rmi.transport.Transport$1.run(Transport.java:197) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.Transport.serviceCall(Transport.java:196) at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:573) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:834) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:688) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:687) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748)

FAILURE: Build failed with an exception.

• What went wrong: Execution failed for task ':app:kaptGenerateStubsDebugKotlin'.

Internal compiler error. See log for more details

• Try: Run with --info or --debug option to get more log output. Run with --scan to get full insights.

• Exception is: org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:kaptGenerateStubsDebugKotlin'. at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.lambda$executeIfValid$1(ExecuteActionsTaskExecuter.java:205) at org.gradle.internal.Try$Failure.ifSuccessfulOrElse(Try.java:263) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:203) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:184) at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:109) at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46) at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:62) at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57) at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:56) at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36) at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:77) at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:55) at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52) at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:416) at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:406) at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:165) at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:250) at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:158) at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:102) at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36) at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:52) at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:41) at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:372) at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:359) at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:352) at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:338) at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.lambda$run$0(DefaultPlanExecutor.java:127) at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:191) at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.executeNextNode(DefaultPlanExecutor.java:182) at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:124) at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64) at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48) at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56) Caused by: org.gradle.api.GradleException: Internal compiler error. See log for more details at org.jetbrains.kotlin.gradle.tasks.TasksUtilsKt.throwGradleExceptionIfError(tasksUtils.kt:15) at org.jetbrains.kotlin.compilerRunner.GradleKotlinCompilerWork.run(GradleKotlinCompilerWork.kt:122) at org.jetbrains.kotlin.compilerRunner.GradleCompilerRunner.runCompilerAsync(GradleKotlinCompilerRunner.kt:148) at org.jetbrains.kotlin.compilerRunner.GradleCompilerRunner.runCompilerAsync(GradleKotlinCompilerRunner.kt:143) at org.jetbrains.kotlin.compilerRunner.GradleCompilerRunner.runJvmCompilerAsync(GradleKotlinCompilerRunner.kt:83) at org.jetbrains.kotlin.gradle.tasks.KotlinCompile.callCompilerAsync$kotlin_gradle_plugin(Tasks.kt:422) at org.jetbrains.kotlin.gradle.tasks.KotlinCompile.callCompilerAsync$kotlin_gradle_plugin(Tasks.kt:345) at org.jetbrains.kotlin.gradle.tasks.AbstractKotlinCompile.executeImpl(Tasks.kt:306) at org.jetbrains.kotlin.gradle.tasks.AbstractKotlinCompile.execute(Tasks.kt:277) at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:104) at org.gradle.api.internal.project.taskfactory.IncrementalTaskInputsTaskAction.doExecute(IncrementalTaskInputsTaskAction.java:47) at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:42) at org.gradle.api.internal.project.taskfactory.AbstractIncrementalTaskAction.execute(AbstractIncrementalTaskAction.java:25) at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:28) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$3.run(ExecuteActionsTaskExecuter.java:568) at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:402) at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:394) at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:165) at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:250) at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:158) at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:92) at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:553) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:536) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.access$300(ExecuteActionsTaskExecuter.java:109) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$TaskExecution.executeWithPreviousOutputFiles(ExecuteActionsTaskExecuter.java:276) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$TaskExecution.execute(ExecuteActionsTaskExecuter.java:265) at org.gradle.internal.execution.steps.ExecuteStep.lambda$execute$0(ExecuteStep.java:32) at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:32) at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:26) at org.gradle.internal.execution.steps.CleanupOutputsStep.execute(CleanupOutputsStep.java:63) at org.gradle.internal.execution.steps.CleanupOutputsStep.execute(CleanupOutputsStep.java:35) at org.gradle.internal.execution.steps.ResolveInputChangesStep.execute(ResolveInputChangesStep.java:49) at org.gradle.internal.execution.steps.ResolveInputChangesStep.execute(ResolveInputChangesStep.java:34) at org.gradle.internal.execution.steps.CancelExecutionStep.execute(CancelExecutionStep.java:43) at org.gradle.internal.execution.steps.TimeoutStep.executeWithoutTimeout(TimeoutStep.java:73) at org.gradle.internal.execution.steps.TimeoutStep.execute(TimeoutStep.java:54) at org.gradle.internal.execution.steps.CatchExceptionStep.execute(CatchExceptionStep.java:34) at org.gradle.internal.execution.steps.CreateOutputsStep.execute(CreateOutputsStep.java:44) at org.gradle.internal.execution.steps.SnapshotOutputsStep.execute(SnapshotOutputsStep.java:54) at org.gradle.internal.execution.steps.SnapshotOutputsStep.execute(SnapshotOutputsStep.java:38) at org.gradle.internal.execution.steps.BroadcastChangingOutputsStep.execute(BroadcastChangingOutputsStep.java:49) at org.gradle.internal.execution.steps.CacheStep.executeWithoutCache(CacheStep.java:153) at org.gradle.internal.execution.steps.CacheStep.execute(CacheStep.java:67) at org.gradle.internal.execution.steps.CacheStep.execute(CacheStep.java:41) at org.gradle.internal.execution.steps.StoreExecutionStateStep.execute(StoreExecutionStateStep.java:44) at org.gradle.internal.execution.steps.StoreExecutionStateStep.execute(StoreExecutionStateStep.java:33) at org.gradle.internal.execution.steps.RecordOutputsStep.execute(RecordOutputsStep.java:38) at org.gradle.internal.execution.steps.RecordOutputsStep.execute(RecordOutputsStep.java:24) at org.gradle.internal.execution.steps.SkipUpToDateStep.executeBecause(SkipUpToDateStep.java:92) at org.gradle.internal.execution.steps.SkipUpToDateStep.lambda$execute$0(SkipUpToDateStep.java:85) at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:55) at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:39) at org.gradle.internal.execution.steps.ResolveChangesStep.execute(ResolveChangesStep.java:76) at org.gradle.internal.execution.steps.ResolveChangesStep.execute(ResolveChangesStep.java:37) at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:36) at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:26) at org.gradle.internal.execution.steps.ResolveCachingStateStep.execute(ResolveCachingStateStep.java:94) at org.gradle.internal.execution.steps.ResolveCachingStateStep.execute(ResolveCachingStateStep.java:49) at org.gradle.internal.execution.steps.CaptureStateBeforeExecutionStep.execute(CaptureStateBeforeExecutionStep.java:79) at org.gradle.internal.execution.steps.CaptureStateBeforeExecutionStep.execute(CaptureStateBeforeExecutionStep.java:53) at org.gradle.internal.execution.steps.ValidateStep.execute(ValidateStep.java:74) at org.gradle.internal.execution.steps.SkipEmptyWorkStep.lambda$execute$2(SkipEmptyWorkStep.java:78) at org.gradle.internal.execution.steps.SkipEmptyWorkStep.execute(SkipEmptyWorkStep.java:78) at org.gradle.internal.execution.steps.SkipEmptyWorkStep.execute(SkipEmptyWorkStep.java:34) at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsStartedStep.execute(MarkSnapshottingInputsStartedStep.java:39) at org.gradle.internal.execution.steps.LoadExecutionStateStep.execute(LoadExecutionStateStep.java:40) at org.gradle.internal.execution.steps.LoadExecutionStateStep.execute(LoadExecutionStateStep.java:28) at org.gradle.internal.execution.impl.DefaultWorkExecutor.execute(DefaultWorkExecutor.java:33) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:192) ... 30 more

• Get more help at https://help.gradle.org

BUILD FAILED in 2s 17 actionable tasks: 1 executed, 16 up-to-date

**Expected behavior**

**Environment**
 - Kotlin version: 1.3.72
 - Library version: :1.0.0-RC
 - Kotlin platforms: JVM
 - Gradle version:  4.0.1
 - IDE version  Android Studio 4.0

[sandwwraith]

1.0.0-RC version is compatible only with Kotlin 1.4, 1.3.72 won't work

[humblehacker]

I was getting exactly the same error when updating a project despite being on Kotlin 1.4.10. I had to replace this:

implementation "org.jetbrains.kotlinx:kotlinx-serialization-runtime:0.11.1"

with this:

implementation "org.jetbrains.kotlinx:kotlinx-serialization-core:1.0.1"
implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:1.0.1"

Hope this helps someone else.

[faranjit]

1.0.0-RC version is compatible only with Kotlin 1.4, 1.3.72 won't work

My kotlin version is 1.4.10, serialization version is 1.0.1 but I am facing with this issue. I have also tried this but i could not resolve :(

[sandwwraith]

@faranjit maybe you have some other dependencies/modules that pull old version of library?

[adityamdk]

My Kotlin version is 1.4.20-RC, serialization version is 1.0.1 but I am facing with this issue. None of the above suggestions are working for me. :(

[olafcm]

Please reopen this issue

[sandwwraith]

It looks like a kapt bug to me, but I'll see if anything can be done in the plugin

[OliverCulleyDeLange]

+1 For this issue, it seems to be blocking out upgrade to kotlin 1.5 / 1.6 Has there been any progress or workarounds?

[sandwwraith]

You may try to use old backend, since this error is IR-specific

[sandwwraith]

Also, do you use KAPT? can you provide a reproducer?

[OliverCulleyDeLange]

Sorry, what do you mean by 'old backend' and what is IR? We do use KAPT I will try to create a minimal sample project, yes.

[uniruddh]

isn't there any workaround or compatible versions?

[sandwwraith]

Is this issue still actual for Kotlin 1.8.x? If so, can anyone provide a reproducer?