bizzare scala exception

gistfile1.txt

exception triggered by applying a parser using the scala std lib parser combinators to a CharArrayReader

source not publicly available for various reasons. If I can come up with a minimal example, i'll make it available

java.lang.NullPointerException
	at VwTools$.<init>(<console>:30)
	at VwTools$.<clinit>(<console>)
	at .<init>(<console>:25)
	at .<clinit>(<console>)
	at .<init>(<console>:11)
	at .<clinit>(<console>)
	at $print(<console>)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at scala.tools.nsc.interpreter.IMain$ReadEvalPrint.call(IMain.scala:704)
	at scala.tools.nsc.interpreter.IMain$Request.loadAndRun(IMain.scala:914)
	at scala.tools.nsc.interpreter.IMain.loadAndRunReq$1(IMain.scala:546)
	at scala.tools.nsc.interpreter.IMain.interpret(IMain.scala:577)
	at scala.tools.nsc.interpreter.IMain.interpret(IMain.scala:543)
	at scala.tools.nsc.interpreter.ILoop.reallyInterpret$1(ILoop.scala:694)
	at scala.tools.nsc.interpreter.ILoop.interpretStartingWith(ILoop.scala:745)
	at scala.tools.nsc.interpreter.ILoop.command(ILoop.scala:651)
	at scala.tools.nsc.interpreter.ILoop.processLine$1(ILoop.scala:542)
	at scala.tools.nsc.interpreter.ILoop.loop(ILoop.scala:550)
	at scala.tools.nsc.interpreter.ILoop.process(ILoop.scala:822)
	at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:67)
	at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:80)
	at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
	at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)