Error:scalac: error while loading <root>, invalid CEN header (bad signature)
Error:scalac: Error: object scala.runtime in compiler mirror not found.
scala.reflect.internal.MissingRequirementError: object scala.runtime in compiler mirror not found.

    at scala.reflect.internal.MissingRequirementError$.signal(MissingRequirementError.scala:16)

    at scala.reflect.internal.MissingRequirementError$.notFound(MissingRequirementError.scala:17)

    at scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:48)

    at scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:40)

    at scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:61)

    at scala.reflect.internal.Mirrors$RootsBase.getPackage(Mirrors.scala:172)

    at scala.reflect.internal.Mirrors$RootsBase.getRequiredPackage(Mirrors.scala:175)

    at scala.reflect.internal.Definitions$DefinitionsClass.RuntimePackage$lzycompute(Definitions.scala:181)

    at scala.reflect.internal.Definitions$DefinitionsClass.RuntimePackage(Definitions.scala:181)

    at scala.reflect.internal.Definitions$DefinitionsClass.RuntimePackageClass$lzycompute(Definitions.scala:182)

    at scala.reflect.internal.Definitions$DefinitionsClass.RuntimePackageClass(Definitions.scala:182)

    at scala.reflect.internal.Definitions$DefinitionsClass.AnnotationDefaultAttr$lzycompute(Definitions.scala:1015)

    at scala.reflect.internal.Definitions$DefinitionsClass.AnnotationDefaultAttr(Definitions.scala:1014)

    at scala.reflect.internal.Definitions$DefinitionsClass.syntheticCoreClasses$lzycompute(Definitions.scala:1144)

    at scala.reflect.internal.Definitions$DefinitionsClass.syntheticCoreClasses(Definitions.scala:1143)

    at scala.reflect.internal.Definitions$DefinitionsClass.symbolsNotPresentInBytecode$lzycompute(Definitions.scala:1187)

    at scala.reflect.internal.Definitions$DefinitionsClass.symbolsNotPresentInBytecode(Definitions.scala:1187)

    at scala.reflect.internal.Definitions$DefinitionsClass.init(Definitions.scala:1252)

    at scala.tools.nsc.Global$Run.<init>(Global.scala:1289)

    at xsbt.CachedCompiler0$$anon$2.<init>(CompilerInterface.scala:105)

    at xsbt.CachedCompiler0.run(CompilerInterface.scala:105)

    at xsbt.CachedCompiler0.run(CompilerInterface.scala:94)

    at xsbt.CompilerInterface.run(CompilerInterface.scala:22)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.lang.reflect.Method.invoke(Method.java:606)

    at sbt.compiler.AnalyzingCompiler.call(AnalyzingCompiler.scala:101)

    at sbt.compiler.AnalyzingCompiler.compile(AnalyzingCompiler.scala:47)

    at sbt.compiler.AnalyzingCompiler.compile(AnalyzingCompiler.scala:41)

    at org.jetbrains.jps.incremental.scala.local.IdeaIncrementalCompiler.compile(IdeaIncrementalCompiler.scala:29)

    at org.jetbrains.jps.incremental.scala.local.LocalServer.compile(LocalServer.scala:26)

    at org.jetbrains.jps.incremental.scala.remote.Main$.make(Main.scala:67)

    at org.jetbrains.jps.incremental.scala.remote.Main$.nailMain(Main.scala:24)

    at org.jetbrains.jps.incremental.scala.remote.Main.nailMain(Main.scala)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.lang.reflect.Method.invoke(Method.java:606)

    at com.martiansoftware.nailgun.NGSession.run(NGSession.java:319)