scala.tools.nsc.MissingRequirementError: object scala not found.
   at scala.tools.nsc.symtab.Definitions$definitions$.getModuleOrClass(Definitions.java:655)
   at scala.tools.nsc.symtab.Definitions$definitions$.getModule(Definitions.java:605)
   at scala.tools.nsc.symtab.Definitions$definitions$.ScalaPackage(Definitions.java:145)
   at scala.tools.nsc.symtab.Definitions$definitions$.ScalaPackageClass(Definitions.java:146)
   at scala.tools.nsc.symtab.Definitions$definitions$.AnyClass(Definitions.java:176)
   at scala.tools.nsc.symtab.Definitions$definitions$.init(Definitions.java:814)
   at scala.tools.nsc.Global$Run.<init>(Global.java:698)
   at scala.tools.nsc.interactive.Global$TyperRun.<init>(Global.java:925)
   at scala.tools.nsc.interactive.Global.newTyperRun(Global.java:948)
   at scala.tools.nsc.interactive.Global.<init>(Global.java:166)
   at org.netbeans.modules.scala.core.interactive.Global.<init>(Global.java:13)
   at org.netbeans.modules.scala.core.ScalaGlobal.<init>(ScalaGlobal.java:88)
   at org.netbeans.modules.scala.core.ScalaGlobal$.getGlobal(ScalaGlobal.java:628)
   at org.netbeans.modules.scala.core.ScalaParserResult.<init>(ScalaParserResult.java:61)
   at org.netbeans.modules.scala.core.ScalaParserResult$.apply(ScalaParserResult.java:186)
   at org.netbeans.modules.scala.core.ScalaParser.parse(ScalaParser.java:99)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callParse(TaskProcessor.java:647)
   at org.netbeans.modules.parsing.impl.SourceCache.getResult(SourceCache.java:213)
   at org.netbeans.modules.parsing.api.ResultIterator.getParserResult(ResultIterator.java:138)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$3.run(RepositoryUpdater.java:2121)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:635)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:154)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:138)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:210)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:207)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:168)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:356)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:71)
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:207)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:106)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.indexEmbedding(RepositoryUpdater.java:2104)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doIndex(RepositoryUpdater.java:1950)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.access$1400(RepositoryUpdater.java:1597)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$2.run(RepositoryUpdater.java:1778)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$2.run(RepositoryUpdater.java:1776)
   at org.netbeans.modules.parsing.impl.indexing.errors.TaskCache.refreshTransaction(TaskCache.java:460)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.index(RepositoryUpdater.java:1776)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork.scanSource(RepositoryUpdater.java:3557)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork.scanSources(RepositoryUpdater.java:3458)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$RootsWork.getDone(RepositoryUpdater.java:3201)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doTheWork(RepositoryUpdater.java:2231)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task._run(RepositoryUpdater.java:3988)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.run(RepositoryUpdater.java:3928)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:615)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:720)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
   at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
   at java.util.concurrent.FutureTask.run(FutureTask.java:138)
   at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
   at java.lang.Thread.run(Thread.java:680)