TransformException: Error while generating the main dex list

[zabojad]

I can't build my project after having added this library:

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:transformClassesWithMultidexlistForDebug'.
> com.android.build.api.transform.TransformException: Error while generating the main dex list.

* 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:transformClassesWithMultidexlistForDebug'.
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:100)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:70)
        at org.gradle.api.internal.tasks.execution.OutputDirectoryCreatingTaskExecuter.execute(OutputDirectoryCreatingTaskExecuter.java:51)
        at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:62)
        at org.gradle.api.internal.tasks.execution.ResolveTaskOutputCachingStateExecuter.execute(ResolveTaskOutputCachingStateExecuter.java:54)
        at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:60)
        at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:97)
        at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:87)
        at org.gradle.api.internal.tasks.execution.ResolveTaskArtifactStateTaskExecuter.execute(ResolveTaskArtifactStateTaskExecuter.java:52)
        at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52)
        at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:54)
        at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)
        at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:34)
        at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker$1.run(DefaultTaskGraphExecuter.java:248)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110)
        at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:241)
        at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:230)
        at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.processTask(DefaultTaskPlanExecutor.java:123)
        at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.access$200(DefaultTaskPlanExecutor.java:79)
        at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:104)
        at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:98)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.execute(DefaultTaskExecutionPlan.java:626)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.executeWithTask(DefaultTaskExecutionPlan.java:581)
        at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.run(DefaultTaskPlanExecutor.java:98)
        at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63)
        at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46)
        at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)
Caused by: java.lang.RuntimeException: com.android.build.api.transform.TransformException: Error while generating the main dex list.
        at com.android.builder.profile.Recorder$Block.handleException(Recorder.java:55)
        at com.android.builder.profile.ThreadRecorder.record(ThreadRecorder.java:104)
        at com.android.build.gradle.internal.pipeline.TransformTask.transform(TransformTask.java:212)
        at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:73)
        at org.gradle.api.internal.project.taskfactory.IncrementalTaskAction.doExecute(IncrementalTaskAction.java:46)
        at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:39)
        at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:26)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$1.run(ExecuteActionsTaskExecuter.java:121)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:110)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:92)
        ... 29 more
Caused by: com.android.build.api.transform.TransformException: Error while generating the main dex list.
        at com.android.build.gradle.internal.transforms.D8MainDexListTransform.transform(D8MainDexListTransform.kt:127)
        at com.android.build.gradle.internal.pipeline.TransformTask$2.call(TransformTask.java:221)
        at com.android.build.gradle.internal.pipeline.TransformTask$2.call(TransformTask.java:217)
        at com.android.builder.profile.ThreadRecorder.record(ThreadRecorder.java:102)
        ... 41 more
Caused by: com.android.builder.multidex.D8MainDexList$MainDexListException: com.android.tools.r8.errors.CompilationError: Program type already present: com.reactlibrary.BuildConfig
        at com.android.builder.multidex.D8MainDexList.generate(D8MainDexList.java:87)
        at com.android.build.gradle.internal.transforms.D8MainDexListTransform.transform(D8MainDexListTransform.kt:114)
        ... 44 more
Caused by: com.android.tools.r8.errors.CompilationError: Program type already present: com.reactlibrary.BuildConfig
        at com.android.tools.r8.utils.ProgramClassCollection.resolveClassConflictImpl(ProgramClassCollection.java:64)
        at com.android.tools.r8.utils.ProgramClassCollection.lambda$create$0(ProgramClassCollection.java:25)
        at com.android.tools.r8.utils.ProgramClassCollection.create(ProgramClassCollection.java:24)
        at com.android.tools.r8.graph.LazyLoadedDexApplication$Builder.build(LazyLoadedDexApplication.java:121)
        at com.android.tools.r8.dex.ApplicationReader.read(ApplicationReader.java:122)
        at com.android.tools.r8.dex.ApplicationReader.read(ApplicationReader.java:86)
        at com.android.tools.r8.GenerateMainDexList.run(GenerateMainDexList.java:40)
        at com.android.tools.r8.GenerateMainDexList.run(GenerateMainDexList.java:110)
        at com.android.builder.multidex.D8MainDexList.generate(D8MainDexList.java:83)
        ... 45 more


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

[zabojad]

OK, I've found the cause of this issue.

I had another lib which had the same android package name com.reactlibrary which is the default package name given by react-native-create-library.

I would strongly suggest to give a more custom package name for react-native-threads, what do you think?

@Traviskn ?

[atlkuk]

Are there some news about this issue? I have the same conflict about package name

[Traviskn]

You are right, we should update the package name to be actually unique to this project

[CleyFaye]

Hi,

We're facing this problem. Short term we're going to fork and update the package name. However I'd be happy to provide a PR for this afterward. What package name would be appropriate ?

[roaringUnicorn]

Hi,

Same problem here... Would be really nice to solve this !

@CleyFaye have you made a fork ? I don't see your name in the fork list.

[CleyFaye]

Yes, we ended making a fork, but it's not published. We might do that though; I'll have to check with the higher ups if it's fine with them, since we changed a handful of other things to handle some error cases.