Error:scalac: Error: assertion failed: List(object package$DebugNode, object package$DebugNode)

[zml张明磊]

Hello,

Recently, I build spark from apache/master and getting the following error. 
From stackoverflow 
http://stackoverflow.com/questions/24165184/scalac-assertion-failed-while-run-scalatest-in-idea,
 I can not find Preferences > Scala he said in Intellij IDEA. And SBT is not 
worked for me in our company. Use maven instead. How can I fix and work around 
it ? Last : happy new year to everyone.

Error:scalac: Error: assertion failed: List(object package$DebugNode, object 
package$DebugNode)
      java.lang.AssertionError: assertion failed: List(object 
package$DebugNode, object package$DebugNode)
       at scala.reflect.internal.Symbols$Symbol.suchThat(Symbols.scala:1678)
       at 
scala.reflect.internal.Symbols$ClassSymbol.companionModule0(Symbols.scala:2988)
       at 
scala.reflect.internal.Symbols$ClassSymbol.companionModule(Symbols.scala:2991)
       at 
scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder.genClass(GenASM.scala:1371)
       at scala.tools.nsc.backend.jvm.GenASM$AsmPhase.run(GenASM.scala:120)
       at scala.tools.nsc.Global$Run.compileUnitsInternal(Global.scala:1583)
       at scala.tools.nsc.Global$Run.compileUnits(Global.scala:1557)
       at scala.tools.nsc.Global$Run.compileSources(Global.scala:1553)
       at scala.tools.nsc.Global$Run.compile(Global.scala:1662)
       at xsbt.CachedCompiler0.run(CompilerInterface.scala:126)


thanks,
Minglei.