title: Android Studio 3.0 Gradle sync failed: java.lang.AssertionError (in UnresolvedDependenciesReporter)
body: <p>When migrating to Android Studio 3.0-beta1, I am running into a gradle sync failed error that does not provide much info. There is no error message in the gradle console. I had to go to the idea.log file to get the following stack trace:</p>
  
  <pre><code>java.lang.RuntimeException: java.lang.AssertionError
      at com.intellij.openapi.application.TransactionGuardImpl.submitTransactionAndWait(TransactionGuardImpl.java:174)
      at com.intellij.openapi.command.WriteCommandAction.execute(WriteCommandAction.java:155)
      at com.android.tools.idea.gradle.project.sync.idea.data.service.ModuleModelDataService.importData(ModuleModelDataService.java:80)
      at com.android.tools.idea.gradle.project.sync.idea.data.service.ModuleModelDataService.importData(ModuleModelDataService.java:50)
      at com.intellij.openapi.externalSystem.service.project.manage.ProjectDataManager.doImportData(ProjectDataManager.java:246)
      at com.intellij.openapi.externalSystem.service.project.manage.ProjectDataManager.importData(ProjectDataManager.java:143)
      at com.intellij.openapi.externalSystem.service.project.manage.ProjectDataManager.importData(ProjectDataManager.java:198)
      at com.intellij.openapi.externalSystem.service.project.manage.ProjectDataManager.importData(ProjectDataManager.java:204)
      at com.android.tools.idea.gradle.project.sync.idea.IdeaSyncPopulateProjectTask.doSelectiveImport(IdeaSyncPopulateProjectTask.java:206)
      at com.android.tools.idea.gradle.project.sync.idea.IdeaSyncPopulateProjectTask.populate(IdeaSyncPopulateProjectTask.java:156)
      at com.android.tools.idea.gradle.project.sync.idea.IdeaSyncPopulateProjectTask.access$000(IdeaSyncPopulateProjectTask.java:51)
      at com.android.tools.idea.gradle.project.sync.idea.IdeaSyncPopulateProjectTask$1.run(IdeaSyncPopulateProjectTask.java:144)
      at com.intellij.openapi.progress.impl.CoreProgressManager$TaskRunnable.run(CoreProgressManager.java:726)
      at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$1(CoreProgressManager.java:176)
      at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:556)
      at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:501)
      at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:66)
      at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:163)
      at com.intellij.openapi.progress.impl.ProgressManagerImpl$1.run(ProgressManagerImpl.java:137)
      at com.intellij.openapi.application.impl.ApplicationImpl$2.run(ApplicationImpl.java:334)
      at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
      at java.util.concurrent.FutureTask.run(FutureTask.java:266)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
      at java.lang.Thread.run(Thread.java:745)
  Caused by: java.lang.AssertionError
      at com.android.tools.idea.gradle.project.sync.issues.UnresolvedDependenciesReporter.report(UnresolvedDependenciesReporter.java:79)
      at com.android.tools.idea.gradle.project.sync.issues.SyncIssuesReporter.report(SyncIssuesReporter.java:86)
      at com.android.tools.idea.gradle.project.sync.issues.SyncIssuesReporter.report(SyncIssuesReporter.java:71)
      at com.android.tools.idea.gradle.project.sync.setup.module.android.DependenciesAndroidModuleSetupStep.doSetUpModule(DependenciesAndroidModuleSetupStep.java:98)
      at com.android.tools.idea.gradle.project.sync.setup.module.android.DependenciesAndroidModuleSetupStep.doSetUpModule(DependenciesAndroidModuleSetupStep.java:64)
      at com.android.tools.idea.gradle.project.sync.setup.module.ModuleSetupStep.setUpModule(ModuleSetupStep.java:34)
      at com.android.tools.idea.gradle.project.sync.setup.module.AndroidModuleSetup.setUpModule(AndroidModuleSetup.java:44)
      at com.android.tools.idea.gradle.project.sync.idea.data.service.AndroidModuleModelDataService.setUpModule(AndroidModuleModelDataService.java:93)
      at com.android.tools.idea.gradle.project.sync.idea.data.service.AndroidModuleModelDataService.importData(AndroidModuleModelDataService.java:79)
      at com.android.tools.idea.gradle.project.sync.idea.data.service.ModuleModelDataService$1.run(ModuleModelDataService.java:78)
      at com.intellij.openapi.command.WriteCommandAction$Simple.run(WriteCommandAction.java:234)
      at com.intellij.openapi.application.RunResult.run(RunResult.java:35)
      at com.intellij.openapi.command.WriteCommandAction.lambda$null$1(WriteCommandAction.java:171)
      at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:1023)
      at com.intellij.openapi.command.WriteCommandAction.lambda$performWriteCommandAction$2(WriteCommandAction.java:170)
      at com.intellij.openapi.command.WriteCommandAction.lambda$doExecuteCommand$4(WriteCommandAction.java:210)
      at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:149)
      at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:119)
      at com.intellij.openapi.command.WriteCommandAction.doExecuteCommand(WriteCommandAction.java:212)
      at com.intellij.openapi.command.WriteCommandAction.performWriteCommandAction(WriteCommandAction.java:168)
      at com.intellij.openapi.command.WriteCommandAction.lambda$execute$0(WriteCommandAction.java:155)
      at com.intellij.openapi.application.TransactionGuardImpl.lambda$submitTransactionAndWait$2(TransactionGuardImpl.java:163)
      at com.intellij.openapi.application.TransactionGuardImpl.runSyncTransaction(TransactionGuardImpl.java:86)
      at com.intellij.openapi.application.TransactionGuardImpl.lambda$submitTransaction$1(TransactionGuardImpl.java:109)
      at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.runNextEvent(LaterInvocator.java:410)
      at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:399)
      at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
      at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:762)
      at java.awt.EventQueue.access$500(EventQueue.java:98)
      at java.awt.EventQueue$3.run(EventQueue.java:715)
      at java.awt.EventQueue$3.run(EventQueue.java:709)
      at java.security.AccessController.doPrivileged(Native Method)
      at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
      at java.awt.EventQueue.dispatchEvent(EventQueue.java:732)
      at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:827)
      at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:655)
      at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:365)
      at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
      at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
      at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
      at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
      at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
      at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
  </code></pre>
  
  <p>I followed the <a href="https://developer.android.com/studio/build/gradle-plugin-3-0-0-migration.html" rel="noreferrer">migration documentation</a> but still can't get the sync to run successfully. Not sure if this is an issue in Android Studio 3.0-beta1 or my project configuration. I have run other projects and created new ones with Android Studio 3.0-alphaX so leaning towards my project.</p>