Android Studio 3.2.1 - Não é possível sincronizar o projeto com os arquivos gradle: o argumento para o parâmetro @NotNull 'message' de… não deve ser nulo

Estou com um problema ao usar o AndroidStudio. Eu o instalei recentemente na minha máquina Kubuntu 18.04 e queria criar meu primeiro projeto. Everyhting funcionou bem e o projeto foi aberto. O único problema: não consigo executar meus aplicativos. Eu não consigo nem olhar para as atividades na exibição do design - ele espera para sempre a construção terminar. Quando quero executar os aplicativos, ele não possui módulos.

epois de pesquisar por um tempo na Web, tentei sincronizar meu projeto com os arquivos gradle, porque isso parece resolver problemas semelhantes, mas uma vez feito isso, ocorre o seguinte erro:

Argument for @NotNull parameter 'message' of com/android/tools/idea/gradle/project/sync/GradleSyncState.syncFailed must not be null
    java.lang.IllegalArgumentException: Argument for @NotNull parameter 'message' of com/android/tools/idea/gradle/project/sync/GradleSyncState.syncFailed must not be null
        at com.android.tools.idea.gradle.project.sync.GradleSyncState.$$reportNull$$0(GradleSyncState.java)
        at com.android.tools.idea.gradle.project.sync.GradleSyncState.syncFailed(GradleSyncState.java)
        at com.android.tools.idea.gradle.project.sync.idea.IdeaSyncPopulateProjectTask.doPopulateProject(IdeaSyncPopulateProjectTask.java:135)
        at com.android.tools.idea.gradle.project.sync.idea.IdeaSyncPopulateProjectTask.populate(IdeaSyncPopulateProjectTask.java:97)
        at com.android.tools.idea.gradle.project.sync.idea.IdeaSyncPopulateProjectTask.access$000(IdeaSyncPopulateProjectTask.java:39)
        at com.android.tools.idea.gradle.project.sync.idea.IdeaSyncPopulateProjectTask$1.run(IdeaSyncPopulateProjectTask.java:86)
        at com.intellij.openapi.progress.impl.CoreProgressManager$TaskRunnable.run(CoreProgressManager.java:750)
        at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$1(CoreProgressManager.java:157)
        at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:580)
        at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:525)
        at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:85)
        at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:144)
        at com.intellij.openapi.progress.impl.CoreProgressManager$4.run(CoreProgressManager.java:395)
        at com.intellij.openapi.application.impl.ApplicationImpl$1.run(ApplicationImpl.java:305)
        at java.util.concurrent.Executors$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)

Depois de fazer isso uma vez, o botão para sincronizar fica desativado e não consigo mais fazê-lo. Eu tenho que reiniciar o IDE para fazer iss

Examinei o arquivo idea.log para rastrear melhor o problema e encontrei o seguint

2018-10-22 22:38:32,254 [d thread 3]   INFO - xecution.GradleExecutionHelper - Passing command-line args to Gradle Tooling API: -Didea.version=3.2 -Djava.awt.headless=true -Pandroid.injected.build.model.only=true -Pandroid.injected.build.model.only.advanced=true -Pandroid.injected.invoked.from.ide=true -Pandroid.injected.build.model.only.versioned=3 -Pandroid.injected.studio.version=3.2.1.0 -Pandroid.builder.sdkDownload=false --init-script /tmp/ijinit.gradle --offline 
2018-10-22 22:38:43,063 [d thread 3]   INFO - e.project.sync.GradleSyncState - Started setup of project 'TestApp'. 
2018-10-22 22:38:43,065 [e-1136-b06]   INFO - idea.project.IndexingSuspender - Consuming IndexingSuspender activation event: SETUP_STARTED 
2018-10-22 22:38:43,263 [e-1136-b06]   INFO - ule.android.SdkModuleSetupStep - Set Android SDK 'Android API 28 Platform (1)' (/home/myusername/Android/Sdk) to module 'app' 
2018-10-22 22:38:43,567 [d thread 3]   WARN - ea.IdeaSyncPopulateProjectTask - Sync failed: null 
java.lang.RuntimeException: java.lang.NullPointerException
    at com.intellij.openapi.application.impl.LaterInvocator.invokeAndWait(LaterInvocator.java:179)
    at com.intellij.openapi.application.impl.ApplicationImpl.invokeAndWait(ApplicationImpl.java:651)
    at com.intellij.openapi.application.impl.ApplicationImpl.invokeAndWait(ApplicationImpl.java:656)
    at com.intellij.openapi.externalSystem.util.ExternalSystemApiUtil.executeOnEdt(ExternalSystemApiUtil.java:480)
    at com.intellij.openapi.externalSystem.util.ExternalSystemApiUtil.executeProjectChangeAction(ExternalSystemApiUtil.java:469)
    at com.intellij.openapi.externalSystem.service.project.manage.ProjectDataManagerImpl.dispose(ProjectDataManagerImpl.java:442)
    at com.intellij.openapi.externalSystem.service.project.manage.ProjectDataManagerImpl.importData(ProjectDataManagerImpl.java:163)
    at com.intellij.openapi.externalSystem.service.project.manage.ProjectDataManagerImpl.importData(ProjectDataManagerImpl.java:221)
    at com.intellij.openapi.externalSystem.service.project.manage.ProjectDataManagerImpl.importData(ProjectDataManagerImpl.java:228)
    at com.android.tools.idea.gradle.project.sync.idea.IdeaSyncPopulateProjectTask.doPopulateProject(IdeaSyncPopulateProjectTask.java:120)
    at com.android.tools.idea.gradle.project.sync.idea.IdeaSyncPopulateProjectTask.populate(IdeaSyncPopulateProjectTask.java:97)
    at com.android.tools.idea.gradle.project.sync.idea.IdeaSyncPopulateProjectTask.access$000(IdeaSyncPopulateProjectTask.java:39)
    at com.android.tools.idea.gradle.project.sync.idea.IdeaSyncPopulateProjectTask$1.run(IdeaSyncPopulateProjectTask.java:86)
    at com.intellij.openapi.progress.impl.CoreProgressManager$TaskRunnable.run(CoreProgressManager.java:750)
    at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$1(CoreProgressManager.java:157)
    at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:580)
    at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:525)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:85)
    at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:144)
    at com.intellij.openapi.progress.impl.CoreProgressManager$4.run(CoreProgressManager.java:395)
    at com.intellij.openapi.application.impl.ApplicationImpl$1.run(ApplicationImpl.java:305)
    at java.util.concurrent.Executors$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.NullPointerException
    at com.intellij.openapi.extensions.Extensions.disposeArea(Extensions.java:171)
    at com.intellij.openapi.module.impl.ModuleImpl.dispose(ModuleImpl.java:146)
    at com.intellij.openapi.util.Disposer$1.execute(Disposer.java:48)
    at com.intellij.openapi.util.Disposer$1.execute(Disposer.java:44)
    at com.intellij.openapi.util.objectTree.ObjectTree.executeActionWithRecursiveGuard(ObjectTree.java:169)
    at com.intellij.openapi.util.objectTree.ObjectTree.executeUnregistered(ObjectTree.java:181)
    at com.intellij.openapi.util.objectTree.ObjectTree.executeAll(ObjectTree.java:140)
    at com.intellij.openapi.util.Disposer.dispose(Disposer.java:129)
    at com.intellij.openapi.util.Disposer.dispose(Disposer.java:125)
    at com.intellij.openapi.module.impl.ModuleManagerImpl$ModuleModelImpl.dispose(ModuleManagerImpl.java:895)
    at com.intellij.openapi.externalSystem.service.project.AbstractIdeModifiableModelsProvider.dispose(AbstractIdeModifiableModelsProvider.java:476)
    at com.intellij.openapi.externalSystem.service.project.manage.ProjectDataManagerImpl$3.execute(ProjectDataManagerImpl.java:445)
    at com.intellij.openapi.externalSystem.util.DisposeAwareProjectChange.run(DisposeAwareProjectChange.java:36)
    at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:1010)
    at com.intellij.openapi.externalSystem.util.ExternalSystemApiUtil.lambda$executeProjectChangeAction$6(ExternalSystemApiUtil.java:469)
    at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:315)
    at com.intellij.openapi.application.impl.LaterInvocator$1.run(LaterInvocator.java:156)
    at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.doRun(LaterInvocator.java:447)
    at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.runNextEvent(LaterInvocator.java:431)
    at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:415)
    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:822)
    at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:763)
    at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:423)
    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)
2018-10-22 22:38:43,570 [e-1136-b06]  ERROR - intellij.openapi.progress.Task - Argument for @NotNull parameter 'message' of com/android/to,ols/idea/gradle/project/sync/GradleSyncState.syncFailed must not be null 
java.lang.IllegalArgumentException: Argument for @NotNull parameter 'message' of com/android/tools/idea/gradle/project/sync/GradleSyncState.syncFailed must not be null
    at com.android.tools.idea.gradle.project.sync.GradleSyncState.$$reportNull$$0(GradleSyncState.java)
    at com.android.tools.idea.gradle.project.sync.GradleSyncState.syncFailed(GradleSyncState.java)
    at com.android.tools.idea.gradle.project.sync.idea.IdeaSyncPopulateProjectTask.doPopulateProject(IdeaSyncPopulateProjectTask.java:135)
    at com.android.tools.idea.gradle.project.sync.idea.IdeaSyncPopulateProjectTask.populate(IdeaSyncPopulateProjectTask.java:97)
    at com.android.tools.idea.gradle.project.sync.idea.IdeaSyncPopulateProjectTask.access$000(IdeaSyncPopulateProjectTask.java:39)
    at com.android.tools.idea.gradle.project.sync.idea.IdeaSyncPopulateProjectTask$1.run(IdeaSyncPopulateProjectTask.java:86)
    at com.intellij.openapi.progress.impl.CoreProgressManager$TaskRunnable.run(CoreProgressManager.java:750)
    at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$1(CoreProgressManager.java:157)
    at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:580)
    at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:525)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:85)
    at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:144)
    at com.intellij.openapi.progress.impl.CoreProgressManager$4.run(CoreProgressManager.java:395)
    at com.intellij.openapi.application.impl.ApplicationImpl$1.run(ApplicationImpl.java:305)
    at java.util.concurrent.Executors$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)
2018-10-22 22:38:43,572 [e-1136-b06]  ERROR - intellij.openapi.progress.Task - Android Studio 3.2.1  Build #AI-181.5540.7.32.5056338 
2018-10-22 22:38:43,572 [e-1136-b06]  ERROR - intellij.openapi.progress.Task - JDK: 1.8.0_152-release 
2018-10-22 22:38:43,572 [e-1136-b06]  ERROR - intellij.openapi.progress.Task - VM: OpenJDK 64-Bit Server VM 
2018-10-22 22:38:43,572 [e-1136-b06]  ERROR - intellij.openapi.progress.Task - Vendor: JetBrains s.r.o 
2018-10-22 22:38:43,572 [e-1136-b06]  ERROR - intellij.openapi.progress.Task - OS: Linux 
2018-10-22 22:38:43,572 [e-1136-b06]  ERROR - intellij.openapi.progress.Task - Last Action: Android.SyncProject

Parece que o projeto não pode ser sincronizado com meus arquivos gradle. Provavelmente, o problema real de executar meu aplicativo se baseia neste. Alguém já teve esse problema antes ou pode me ajudar dizendo como resolver isso?

Sou completamente novo no AndroidStudio e também no Gradl

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