Error:Internal error: (java.lang.ClassNotFoundException)

Buenas, soy nuevo por aca. Me derivaron un proyecto ya empezado. Instale la ultima version de Android Studio sobre Linux. La aplicacion supuestamente ya funcionaba, debo hacerle unas mejoras. El tema es que al compilar me arroja el siguiente error y no encuentro el problema. Alguna sugerencia? Gracias. Saludos.

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.(IndexCounters.java:34)
at com.intellij.util.indexing.impl.MapReduceIndex.(MapReduceIndex.java:86)
at org.jetbrains.jps.backwardRefs.index.CompilerReferenceIndex$CompilerMapReduceIndex.(CompilerReferenceIndex.java:214)
at org.jetbrains.jps.backwardRefs.index.CompilerReferenceIndex.(CompilerReferenceIndex.java:73)
at org.jetbrains.jps.backwardRefs.JavaCompilerBackwardReferenceIndex.(JavaCompilerBackwardReferenceIndex.java:12)
at org.jetbrains.jps.backwardRefs.JavaBackwardReferenceIndexWriter.initialize(JavaBackwardReferenceIndexWriter.java:74)
at org.jetbrains.jps.backwardRefs.JavaBackwardReferenceIndexBuilder.buildStarted(JavaBackwardReferenceIndexBuilder.java:40)
at org.jetbrains.jps.incremental.IncProjectBuilder.runBuild(IncProjectBuilder.java:358)
at org.jetbrains.jps.incremental.IncProjectBuilder.build(IncProjectBuilder.java:178)
at org.jetbrains.jps.cmdline.BuildRunner.runBuild(BuildRunner.java:138)
at org.jetbrains.jps.cmdline.BuildSession.runBuild(BuildSession.java:302)
at org.jetbrains.jps.cmdline.BuildSession.run(BuildSession.java:135)
at org.jetbrains.jps.cmdline.BuildMain$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)