scala.tools.nsc.symtab.Types$TypeError: not found: type SessionRequestActor
   at scala.tools.nsc.typechecker.Contexts$Context.error(Contexts.java:291)
   at scala.tools.nsc.typechecker.Infer$Inferencer.error(Infer.java:205)
   at scala.tools.nsc.typechecker.Typers$Typer.typedIdent$1(Typers.java:3765)
   at scala.tools.nsc.typechecker.Typers$Typer.typed1(Typers.java:4136)
   at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.java:4219)
   at scala.tools.nsc.typechecker.Typers$Typer.typedType(Typers.java:4311)
   at scala.tools.nsc.typechecker.Typers$Typer.typedHigherKindedType(Typers.java:4318)
   at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$63.apply(Typers.java:4046)
   at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$63.apply(Typers.java:4046)
   at scala.tools.nsc.symtab.Types$class.map2Conserve(Types.java:4867)
   at scala.tools.nsc.symtab.SymbolTable.map2Conserve(SymbolTable.java:13)
   at scala.tools.nsc.typechecker.Typers$Typer.typed1(Typers.java:4044)
   at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.java:4219)
   at scala.tools.nsc.typechecker.Typers$Typer.typedQualifier(Typers.java:4287)
   at scala.tools.nsc.typechecker.Typers$Typer.typedQualifier(Typers.java:4295)
   at scala.tools.nsc.interactive.Global.scala$tools$nsc$interactive$Global$$typeMembers(Global.java:809)
   at scala.tools.nsc.interactive.Global$$anonfun$getTypeCompletion$2.apply(Global.java:791)
   at scala.tools.nsc.interactive.Global$$anonfun$getTypeCompletion$2.apply(Global.java:791)
   at scala.tools.nsc.interactive.Global.respondGradually(Global.java:527)
   at scala.tools.nsc.interactive.Global.getTypeCompletion(Global.java:791)
   at scala.tools.nsc.interactive.CompilerControl$AskTypeCompletionItem.apply$mcV$sp(CompilerControl.java:287)
   at scala.tools.nsc.interactive.Global.pollForWork(Global.java:333)
   at scala.tools.nsc.interactive.PresentationCompilerThread.run(PresentationCompilerThread.java:22)