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.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:775)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
   at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
   at java.util.concurrent.FutureTask.run(FutureTask.java:166)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
   at java.lang.Thread.run(Thread.java:722)