title: Error:Internal error: (java.lang.ClassNotFoundException) com.google.wireless.android.sdk.stats.IntellijIndexingStats$Index
body: <p>Android Studio 3.4.</p>
  
  <p>Project SDK (Android API 19 Platform).</p>
  
  <p>Not using FindBugs or SpotBugs.</p>
  
  <p>Every attempt to build, I get this error:</p>
  
  <pre><code>Information:9/05/2019 4:02 PM - Compilation completed with 1 error and 0 warnings in 1 s 763 ms
  Error:Internal error: (java.lang.ClassNotFoundException) com.google.wireless.android.sdk.stats.IntellijIndexingStats$Index
  java.lang.ClassNotFoundException: com.google.wireless.android.sdk.stats.IntellijIndexingStats$Index
      at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
      at com.intellij.util.indexing.counters.IndexCounters.&lt;clinit&gt;(IndexCounters.java:34)
      at com.intellij.util.indexing.impl.MapReduceIndex.&lt;init&gt;(MapReduceIndex.java:86)
      at org.jetbrains.jps.backwardRefs.index.CompilerReferenceIndex$CompilerMapReduceIndex.&lt;init&gt;(CompilerReferenceIndex.java:214)
      at org.jetbrains.jps.backwardRefs.index.CompilerReferenceIndex.&lt;init&gt;(CompilerReferenceIndex.java:73)
      at org.jetbrains.jps.backwardRefs.JavaCompilerBackwardReferenceIndex.&lt;init&gt;(JavaCompilerBackwardReferenceIndex.java:12)
      at org.jetbrains.jps.backwardRefs.JavaBackwardReferenceIndexWriter.initialize(JavaBackwardReferenceIndexWriter.java:74)
      at org.jetbrains.jps.backwardRefs.JavaBackwardReferenceIndexBuilder.buildStarted(JavaBackwardReferenceIndexBuilder.java:40)
      at org.jetbrains.jps.incremental.IncProjectBuilder.runBuild(IncProjectBuilder.java:358)
      at org.jetbrains.jps.incremental.IncProjectBuilder.build(IncProjectBuilder.java:178)
      at org.jetbrains.jps.cmdline.BuildRunner.runBuild(BuildRunner.java:138)
      at org.jetbrains.jps.cmdline.BuildSession.runBuild(BuildSession.java:302)
      at org.jetbrains.jps.cmdline.BuildSession.run(BuildSession.java:135)
      at org.jetbrains.jps.cmdline.BuildMain$MyMessageHandler.lambda$channelRead0$0(BuildMain.java:229)
      at org.jetbrains.jps.service.impl.SharedThreadPoolImpl.lambda$executeOnPooledThread$0(SharedThreadPoolImpl.java:42)
      at java.util.concurrent.Executors$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)
  </code></pre>