# Build Failed: Program type already present: com.facebook.ads.Ad
**URL:** https://discuss.gradle.org/t/build-failed-program-type-already-present-com-facebook-ads-ad/26438
**Category:** Help/Discuss
**Tags:** android
**Created:** [March 28, 2018, 8:58pm UTC](https://discuss.gradle.org/t/build-failed-program-type-already-present-com-facebook-ads-ad/26438 "2018-03-28T20:58:32Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@waseefakhtar](https://discuss.gradle.org/u/waseefakhtar)
#### Post date: [March 28, 2018, 8:58pm UTC](https://discuss.gradle.org/t/build-failed-program-type-already-present-com-facebook-ads-ad/26438/1 "2018-03-28T20:58:32Z")
I try to build a module in Android Studio. It seemed to run on device but when I tried to build an APK, I got an error:
`Program type already present: com.facebook.ads.Ad`
Here’s the complete log:
```
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':NewApp:transformClassesWithMultidexlistForDevDebug'.
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$1.run(ManagedExecutorImpl.java:46)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.RuntimeException: com.android.build.api.transform.TransformException: Error while generating the main dex list.
at com.android.builder.profile.Recorder$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 sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
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)
... 32 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$2.call(TransformTask.java:217)
at com.android.builder.profile.ThreadRecorder.record(ThreadRecorder.java:102)
... 48 more
Caused by: com.android.builder.multidex.D8MainDexList$MainDexListException: com.android.tools.r8.errors.CompilationError: Program type already present: com.facebook.ads.Ad
at com.android.builder.multidex.D8MainDexList.generate(D8MainDexList.java:87)
at com.android.build.gradle.internal.transforms.D8MainDexListTransform.transform(D8MainDexListTransform.kt:114)
... 51 more
Caused by: com.android.tools.r8.errors.CompilationError: Program type already present: com.facebook.ads.Ad
at com.android.tools.r8.utils.ProgramClassCollection.resolveClassConflictImpl(ProgramClassCollection.java:64)
at com.android.tools.r8.utils.ProgramClassCollection.lambda$create$0(ProgramClassCollection.java:25)
at java.util.concurrent.ConcurrentHashMap.merge(ConcurrentHashMap.java:1990)
at com.android.tools.r8.utils.ProgramClassCollection.create(ProgramClassCollection.java:24)
at com.android.tools.r8.graph.LazyLoadedDexApplication$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:36)
at com.android.tools.r8.GenerateMainDexList.run(GenerateMainDexList.java:95)
at com.android.builder.multidex.D8MainDexList.generate(D8MainDexList.java:83)
... 52 more
```
Based on answers I found in other questions, what I tried so far are:
- Clean & rebuild.
- Clean & make project.
- Restart Android Studio.
- Make sure multiDexEnabled is set to true.
- Change JDK versions.
- Change Gradle versions.
None of which worked for me. Also, when I try to look for dependencies in a tree by ./gradle app:dependencies, I find nothing of the sort: com.facebook.ads.Ad. How should I resolve this?
---
### Author:  [@coachroebuck](https://discuss.gradle.org/u/coachroebuck)
#### Post date: [April 24, 2018, 7:56pm UTC](https://discuss.gradle.org/t/build-failed-program-type-already-present-com-facebook-ads-ad/26438/2 "2018-04-24T19:56:26Z")
If you haven’t resolved your problem yet, it would help to see your gradle file. There may be two dependencies that both depend on that library.
How to resolve this: I don’t know. I’m currently dealing with the same thing. I’ve tried to exclude a group, to no prevail.