title: Android studio error java.lang.IllegalArgumentException: Resource name cannot be empty
body: <p>I am attempting to reopen an older Android Studio project in version 3.0.</p>
  
  <p>It compiles and launches just fine, but if I try to edit a layout in the layout designer, it won't load and simply keeps saying that it is waiting for the build to finish (which it has).</p>
  
  <p>When I look in the IDE errors, I see this error:</p>
  
  <pre>provider: org.jetbrains.android.augment.AndroidPsiAugmentProvider@2180343: Resource name cannot be empty.</pre>
  
  <p>As I look though the trace info, I see nothing that points back at my project.</p>
  
  <p>Any suggestions?</p>
  
  <p>Here is the full trace output:</p>
  
  <pre><code>provider: org.jetbrains.android.augment.AndroidPsiAugmentProvider@2180343: Resource name cannot be empty.
  java.lang.IllegalArgumentException: Resource name cannot be empty.
      at com.google.common.base.Preconditions.checkArgument(Preconditions.java:122)
      at com.android.ide.common.res2.ResourceItem.&lt;init&gt;(ResourceItem.java:115)
      at com.android.ide.common.res2.IdGeneratingResourceParser$IdResourceItem.&lt;init&gt;(IdGeneratingResourceParser.java:202)
      at com.android.ide.common.res2.IdGeneratingResourceParser.&lt;init&gt;(IdGeneratingResourceParser.java:81)
      at com.android.ide.common.res2.ResourceSet.createResourceFile(ResourceSet.java:456)
      at com.android.ide.common.res2.ResourceSet.createFileAndItems(ResourceSet.java:111)
      at com.android.ide.common.res2.ResourceSet.handleNewFile(ResourceSet.java:257)
      at com.android.ide.common.res2.ResourceSet.handleNewFile(ResourceSet.java:52)
      at com.android.ide.common.res2.DataSet.loadFile(DataSet.java:275)
      at com.android.tools.idea.res.ResourceFolderRepository$InitialScanState.loadFile(ResourceFolderRepository.java:325)
      at com.android.tools.idea.res.ResourceFolderRepository.scanFileResourceFile(ResourceFolderRepository.java:524)
      at com.android.tools.idea.res.ResourceFolderRepository.scanFileResourceFolder(ResourceFolderRepository.java:477)
      at com.android.tools.idea.res.ResourceFolderRepository.scanResFolder(ResourceFolderRepository.java:449)
      at com.android.tools.idea.res.ResourceFolderRepository.scanRemainingFiles(ResourceFolderRepository.java:375)
      at com.android.tools.idea.res.ResourceFolderRepository.&lt;init&gt;(ResourceFolderRepository.java:119)
      at com.android.tools.idea.res.ResourceFolderRepository.create(ResourceFolderRepository.java:152)
      at com.android.tools.idea.res.ResourceFolderRegistry.get(ResourceFolderRegistry.java:76)
      at com.android.tools.idea.res.ResourceFolderRegistry.get(ResourceFolderRegistry.java:64)
      at com.android.tools.idea.res.ModuleResourceRepository.create(ModuleResourceRepository.java:95)
      at com.android.tools.idea.res.ResourceRepositories.lambda$getModuleResources$2(ResourceRepositories.java:98)
      at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:942)
      at com.android.tools.idea.res.ResourceRepositories.getModuleResources(ResourceRepositories.java:95)
      at com.android.tools.idea.res.ModuleResourceRepository.findModuleResources(ModuleResourceRepository.java:71)
      at com.android.tools.idea.res.ModuleResourceRepository.getOrCreateInstance(ModuleResourceRepository.java:59)
      at com.android.tools.idea.res.ProjectResourceRepository.computeRepositories(ProjectResourceRepository.java:81)
      at com.android.tools.idea.res.ProjectResourceRepository.create(ProjectResourceRepository.java:73)
      at com.android.tools.idea.res.ResourceRepositories.lambda$getProjectResources$1(ResourceRepositories.java:83)
      at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:942)
      at com.android.tools.idea.res.ResourceRepositories.getProjectResources(ResourceRepositories.java:80)
      at com.android.tools.idea.res.ProjectResourceRepository.findProjectResources(ProjectResourceRepository.java:63)
      at com.android.tools.idea.res.ProjectResourceRepository.getOrCreateInstance(ProjectResourceRepository.java:51)
      at com.android.tools.idea.res.AppResourceRepository.computeRepositories(AppResourceRepository.java:156)
      at com.android.tools.idea.res.AppResourceRepository.create(AppResourceRepository.java:123)
      at com.android.tools.idea.res.ResourceRepositories.lambda$getAppResources$0(ResourceRepositories.java:68)
      at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:942)
      at com.android.tools.idea.res.ResourceRepositories.getAppResources(ResourceRepositories.java:65)
      at com.android.tools.idea.res.AppResourceRepository.findAppResources(AppResourceRepository.java:117)
      at com.android.tools.idea.res.AppResourceRepository.getOrCreateInstance(AppResourceRepository.java:99)
      at org.jetbrains.android.dom.converters.ResourceReferenceConverter.getResourceTypesInCurrentModule(ResourceReferenceConverter.java:262)
      at org.jetbrains.android.augment.AndroidPsiAugmentProvider.getAugments(AndroidPsiAugmentProvider.java:67)
      at com.intellij.psi.augment.PsiAugmentProvider.lambda$collectAugments$0(PsiAugmentProvider.java:93)
      at com.intellij.psi.augment.PsiAugmentProvider.forEach(PsiAugmentProvider.java:137)
      at com.intellij.psi.augment.PsiAugmentProvider.collectAugments(PsiAugmentProvider.java:92)
      at com.intellij.psi.impl.source.ClassInnerStuffCache.getAllInnerClasses(ClassInnerStuffCache.java:139)
      at com.intellij.psi.impl.source.ClassInnerStuffCache.lambda$getInnerClasses$3(ClassInnerStuffCache.java:72)
      at com.intellij.psi.util.CachedValuesManager.lambda$getCachedValue$0(CachedValuesManager.java:141)
      at com.intellij.psi.impl.PsiCachedValueImpl.doCompute(PsiCachedValueImpl.java:49)
      at com.intellij.util.CachedValueBase.getValueWithLock(CachedValueBase.java:222)
      at com.intellij.psi.impl.PsiCachedValue.getValueWithLock(PsiCachedValue.java:60)
      at com.intellij.psi.impl.PsiCachedValueImpl.getValue(PsiCachedValueImpl.java:38)
      at com.intellij.psi.util.CachedValuesManager.getCachedValue(CachedValuesManager.java:137)
      at com.intellij.psi.util.CachedValuesManager.getCachedValue(CachedValuesManager.java:127)
      at com.intellij.psi.impl.source.ClassInnerStuffCache.getInnerClasses(ClassInnerStuffCache.java:71)
      at com.intellij.psi.impl.source.ClassInnerStuffCache.getInnerClassesMap(ClassInnerStuffCache.java:182)
      at com.intellij.psi.impl.source.ClassInnerStuffCache.lambda$findInnerClassByName$6(ClassInnerStuffCache.java:102)
      at com.intellij.psi.util.CachedValuesManager.lambda$getCachedValue$0(CachedValuesManager.java:141)
      at com.intellij.psi.impl.PsiCachedValueImpl.doCompute(PsiCachedValueImpl.java:49)
      at com.intellij.util.CachedValueBase.getValueWithLock(CachedValueBase.java:222)
      at com.intellij.psi.impl.PsiCachedValue.getValueWithLock(PsiCachedValue.java:60)
      at com.intellij.psi.impl.PsiCachedValueImpl.getValue(PsiCachedValueImpl.java:38)
      at com.intellij.psi.util.CachedValuesManager.getCachedValue(CachedValuesManager.java:137)
      at com.intellij.psi.util.CachedValuesManager.getCachedValue(CachedValuesManager.java:127)
      at com.intellij.psi.impl.source.ClassInnerStuffCache.findInnerClassByName(ClassInnerStuffCache.java:101)
      at com.intellij.psi.impl.source.PsiClassImpl.findInnerClassByName(PsiClassImpl.java:396)
      at org.jetbrains.android.util.AndroidResourceUtil.findResourceFieldsFromClass(AndroidResourceUtil.java:190)
      at org.jetbrains.android.util.AndroidResourceUtil.findResourceFields(AndroidResourceUtil.java:182)
      at org.jetbrains.android.util.AndroidResourceUtil.findResourceFields(AndroidResourceUtil.java:168)
      at org.jetbrains.android.AndroidGotoRelatedProvider.collectRelatedJavaFiles(AndroidGotoRelatedProvider.java:182)
      at org.jetbrains.android.AndroidGotoRelatedProvider.getLazyItemsForXmlFile(AndroidGotoRelatedProvider.java:112)
      at org.jetbrains.android.AndroidLineMarkerProvider.getMarkerInfo(AndroidLineMarkerProvider.java:91)
      at org.jetbrains.android.AndroidLineMarkerProvider.doGetLineMarkerInfo(AndroidLineMarkerProvider.java:52)
      at org.jetbrains.android.AndroidLineMarkerProvider.collectSlowLineMarkers(AndroidLineMarkerProvider.java:37)
      at com.intellij.codeInsight.daemon.impl.LineMarkersPass.queryProviders(LineMarkersPass.java:209)
      at com.intellij.codeInsight.daemon.impl.LineMarkersPass.lambda$doCollectInformation$3(LineMarkersPass.java:111)
      at com.intellij.codeInsight.daemon.impl.Divider.divideInsideAndOutsideInOneRoot(Divider.java:96)
      at com.intellij.codeInsight.daemon.impl.LineMarkersPass.doCollectInformation(LineMarkersPass.java:106)
      at com.intellij.codeHighlighting.TextEditorHighlightingPass.collectInformation(TextEditorHighlightingPass.java:70)
      at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$null$1(PassExecutorService.java:438)
      at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1156)
      at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$doRun$2(PassExecutorService.java:431)
      at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:556)
      at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:501)
      at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:66)
      at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.doRun(PassExecutorService.java:430)
      at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$run$0(PassExecutorService.java:406)
      at com.intellij.openapi.application.impl.ReadMostlyRWLock.executeByImpatientReader(ReadMostlyRWLock.java:142)
      at com.intellij.openapi.application.impl.ApplicationImpl.executeByImpatientReader(ApplicationImpl.java:242)
      at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.run(PassExecutorService.java:404)
      at com.intellij.concurrency.JobLauncherImpl$VoidForkJoinTask$1.exec(JobLauncherImpl.java:165)
      at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
      at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
      at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
      at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)
  
  
  java.lang.IllegalArgumentException: Resource name cannot be empty.
      at com.google.common.base.Preconditions.checkArgument(Preconditions.java:122)
      at com.android.ide.common.res2.ResourceItem.&lt;init&gt;(ResourceItem.java:115)
      at com.android.ide.common.res2.IdGeneratingResourceParser$IdResourceItem.&lt;init&gt;(IdGeneratingResourceParser.java:202)
      at com.android.ide.common.res2.IdGeneratingResourceParser.&lt;init&gt;(IdGeneratingResourceParser.java:81)
      at com.android.ide.common.res2.ResourceSet.createResourceFile(ResourceSet.java:456)
      at com.android.ide.common.res2.ResourceSet.createFileAndItems(ResourceSet.java:111)
      at com.android.ide.common.res2.ResourceSet.handleNewFile(ResourceSet.java:257)
      at com.android.ide.common.res2.ResourceSet.handleNewFile(ResourceSet.java:52)
      at com.android.ide.common.res2.DataSet.loadFile(DataSet.java:275)
      at com.android.tools.idea.res.ResourceFolderRepository$InitialScanState.loadFile(ResourceFolderRepository.java:325)
      at com.android.tools.idea.res.ResourceFolderRepository.scanFileResourceFile(ResourceFolderRepository.java:524)
      at com.android.tools.idea.res.ResourceFolderRepository.scanFileResourceFolder(ResourceFolderRepository.java:477)
      at com.android.tools.idea.res.ResourceFolderRepository.scanResFolder(ResourceFolderRepository.java:449)
      at com.android.tools.idea.res.ResourceFolderRepository.scanRemainingFiles(ResourceFolderRepository.java:375)
      at com.android.tools.idea.res.ResourceFolderRepository.&lt;init&gt;(ResourceFolderRepository.java:119)
      at com.android.tools.idea.res.ResourceFolderRepository.create(ResourceFolderRepository.java:152)
      at com.android.tools.idea.res.ResourceFolderRegistry.get(ResourceFolderRegistry.java:76)
      at com.android.tools.idea.res.ResourceFolderRegistry.get(ResourceFolderRegistry.java:64)
      at com.android.tools.idea.res.ModuleResourceRepository.create(ModuleResourceRepository.java:95)
      at com.android.tools.idea.res.ResourceRepositories.lambda$getModuleResources$2(ResourceRepositories.java:98)
      at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:942)
      at com.android.tools.idea.res.ResourceRepositories.getModuleResources(ResourceRepositories.java:95)
      at com.android.tools.idea.res.ModuleResourceRepository.findModuleResources(ModuleResourceRepository.java:71)
      at com.android.tools.idea.res.ModuleResourceRepository.getOrCreateInstance(ModuleResourceRepository.java:59)
      at com.android.tools.idea.res.ProjectResourceRepository.computeRepositories(ProjectResourceRepository.java:81)
      at com.android.tools.idea.res.ProjectResourceRepository.create(ProjectResourceRepository.java:73)
      at com.android.tools.idea.res.ResourceRepositories.lambda$getProjectResources$1(ResourceRepositories.java:83)
      at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:942)
      at com.android.tools.idea.res.ResourceRepositories.getProjectResources(ResourceRepositories.java:80)
      at com.android.tools.idea.res.ProjectResourceRepository.findProjectResources(ProjectResourceRepository.java:63)
      at com.android.tools.idea.res.ProjectResourceRepository.getOrCreateInstance(ProjectResourceRepository.java:51)
      at com.android.tools.idea.res.AppResourceRepository.computeRepositories(AppResourceRepository.java:156)
      at com.android.tools.idea.res.AppResourceRepository.create(AppResourceRepository.java:123)
      at com.android.tools.idea.res.ResourceRepositories.lambda$getAppResources$0(ResourceRepositories.java:68)
      at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:942)
      at com.android.tools.idea.res.ResourceRepositories.getAppResources(ResourceRepositories.java:65)
      at com.android.tools.idea.res.AppResourceRepository.findAppResources(AppResourceRepository.java:117)
      at com.android.tools.idea.res.AppResourceRepository.getOrCreateInstance(AppResourceRepository.java:99)
      at org.jetbrains.android.resourceManagers.LocalResourceManager.getResourceNames(LocalResourceManager.java:261)
      at org.jetbrains.android.resourceManagers.ResourceManager.getResourceNames(ResourceManager.java:349)
      at org.jetbrains.android.augment.ResourceTypeClassBase.buildResourceFields(ResourceTypeClassBase.java:40)
      at org.jetbrains.android.augment.ResourceTypeClass.buildLocalResourceFields(ResourceTypeClass.java:30)
      at org.jetbrains.android.augment.AndroidPsiAugmentProvider.getAugments(AndroidPsiAugmentProvider.java:107)
      at com.intellij.psi.augment.PsiAugmentProvider.lambda$collectAugments$0(PsiAugmentProvider.java:93)
      at com.intellij.psi.augment.PsiAugmentProvider.forEach(PsiAugmentProvider.java:137)
      at com.intellij.psi.augment.PsiAugmentProvider.collectAugments(PsiAugmentProvider.java:92)
      at com.intellij.psi.impl.source.ClassInnerStuffCache.getAllFields(ClassInnerStuffCache.java:125)
      at com.intellij.psi.impl.source.ClassInnerStuffCache.lambda$getFields$1(ClassInnerStuffCache.java:60)
      at com.intellij.psi.util.CachedValuesManager.lambda$getCachedValue$0(CachedValuesManager.java:141)
      at com.intellij.psi.impl.PsiCachedValueImpl.doCompute(PsiCachedValueImpl.java:49)
      at com.intellij.util.CachedValueBase.getValueWithLock(CachedValueBase.java:222)
      at com.intellij.psi.impl.PsiCachedValue.getValueWithLock(PsiCachedValue.java:60)
      at com.intellij.psi.impl.PsiCachedValueImpl.getValue(PsiCachedValueImpl.java:38)
      at com.intellij.psi.util.CachedValuesManager.getCachedValue(CachedValuesManager.java:137)
      at com.intellij.psi.util.CachedValuesManager.getCachedValue(CachedValuesManager.java:127)
      at com.intellij.psi.impl.source.ClassInnerStuffCache.getFields(ClassInnerStuffCache.java:59)
      at com.intellij.psi.impl.source.ClassInnerStuffCache.getFieldsMap(ClassInnerStuffCache.java:145)
      at com.intellij.psi.impl.source.ClassInnerStuffCache.lambda$findFieldByName$4(ClassInnerStuffCache.java:82)
      at com.intellij.psi.util.CachedValuesManager.lambda$getCachedValue$0(CachedValuesManager.java:141)
      at com.intellij.psi.impl.PsiCachedValueImpl.doCompute(PsiCachedValueImpl.java:49)
      at com.intellij.util.CachedValueBase.getValueWithLock(CachedValueBase.java:222)
      at com.intellij.psi.impl.PsiCachedValue.getValueWithLock(PsiCachedValue.java:60)
      at com.intellij.psi.impl.PsiCachedValueImpl.getValue(PsiCachedValueImpl.java:38)
      at com.intellij.psi.util.CachedValuesManager.getCachedValue(CachedValuesManager.java:137)
      at com.intellij.psi.util.CachedValuesManager.getCachedValue(CachedValuesManager.java:127)
      at com.intellij.psi.impl.source.ClassInnerStuffCache.findFieldByName(ClassInnerStuffCache.java:80)
      at com.intellij.psi.impl.source.PsiClassImpl.findFieldByName(PsiClassImpl.java:362)
      at org.jetbrains.android.util.AndroidResourceUtil.findResourceFieldsFromClass(AndroidResourceUtil.java:195)
      at org.jetbrains.android.util.AndroidResourceUtil.findResourceFields(AndroidResourceUtil.java:182)
      at org.jetbrains.android.util.AndroidResourceUtil.findResourceFields(AndroidResourceUtil.java:168)
      at org.jetbrains.android.AndroidGotoRelatedProvider.collectRelatedJavaFiles(AndroidGotoRelatedProvider.java:182)
      at org.jetbrains.android.AndroidGotoRelatedProvider.getLazyItemsForXmlFile(AndroidGotoRelatedProvider.java:112)
      at org.jetbrains.android.AndroidLineMarkerProvider.getMarkerInfo(AndroidLineMarkerProvider.java:91)
      at org.jetbrains.android.AndroidLineMarkerProvider.doGetLineMarkerInfo(AndroidLineMarkerProvider.java:52)
      at org.jetbrains.android.AndroidLineMarkerProvider.collectSlowLineMarkers(AndroidLineMarkerProvider.java:37)
      at com.intellij.codeInsight.daemon.impl.LineMarkersPass.queryProviders(LineMarkersPass.java:209)
      at com.intellij.codeInsight.daemon.impl.LineMarkersPass.lambda$doCollectInformation$3(LineMarkersPass.java:111)
      at com.intellij.codeInsight.daemon.impl.Divider.divideInsideAndOutsideInOneRoot(Divider.java:96)
      at com.intellij.codeInsight.daemon.impl.LineMarkersPass.doCollectInformation(LineMarkersPass.java:106)
      at com.intellij.codeHighlighting.TextEditorHighlightingPass.collectInformation(TextEditorHighlightingPass.java:70)
      at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$null$1(PassExecutorService.java:438)
      at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1156)
      at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$doRun$2(PassExecutorService.java:431)
      at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:556)
      at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:501)
      at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:66)
      at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.doRun(PassExecutorService.java:430)
      at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.lambda$run$0(PassExecutorService.java:406)
      at com.intellij.openapi.application.impl.ReadMostlyRWLock.executeByImpatientReader(ReadMostlyRWLock.java:142)
      at com.intellij.openapi.application.impl.ApplicationImpl.executeByImpatientReader(ApplicationImpl.java:242)
      at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.run(PassExecutorService.java:404)
      at com.intellij.concurrency.JobLauncherImpl$VoidForkJoinTask$1.exec(JobLauncherImpl.java:165)
      at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
      at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
      at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
      at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)
  </code></pre>
  
  <p>Update:
  I have not found a solution yet, but a coworker working on another project (from which I forked my project) has just had the same thing happen to him. This leads me to think this may be project specific. However, none of the error trace shows anything in our project. This obviously makes it hard to diagnose.</p>