Strange exception when a record is registered in Play Framework 2.1

Question

I see a strange exception when I enable tracing on my Play 2.1 with a Scala project. This exception occurs whenever I call a controller, including the following controller, which is essentially a ping:

object Ping extends Controller { def get() = Action { Ok("LALA") } } 

Even more disappointing, there is nothing in the exception stack that binds my code to the exception.

Any understanding would be greatly appreciated.

thanks

Below the exception trace:

  2013-02-27 09: 57: 24,163 [T] [] - Exception caught in Netty      
   java.lang.ClassCastException: scala.runtime.BoxedUnit cannot be cast to scala.Function0
     at play.core.server.netty.PlayDefaultUpstreamHandler.channelDisconnected (PlayDefaultUpstreamHandler.scala: 50) ~ [play_2.10.jar: 2.1.0]
     at org.jboss.netty.handler.codec.replay.ReplayingDecoder.cleanup (ReplayingDecoder.java∗73) ~ [netty.jar: na]
     at org.jboss.netty.handler.codec.frame.FrameDecoder.channelDisconnected (FrameDecoder.java data66) ~ [netty.jar: na]
     at org.jboss.netty.channel.Channels.fireChannelDisconnected (Channels.javahaps99) ~ [netty.jar: na]
     at org.jboss.netty.channel.socket.nio.AbstractNioWorker.close (AbstractNioWorker.java:716) ~ [netty.jar: na]
     at org.jboss.netty.channel.socket.nio.NioWorker.read (NioWorker.java:89) ~ [netty.jar: na]
     at org.jboss.netty.channel.socket.nio.AbstractNioWorker.processSelectedKeys (AbstractNioWorker.java:472) ~ [netty.jar: na]
     at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run (AbstractNioWorker.javahaps33) ~ [netty.jar: na]
     at org.jboss.netty.channel.socket.nio.NioWorker.run (NioWorker.java:35) ~ [netty.jar: na]
     at java.util.concurrent.ThreadPoolExecutor $ Worker.runTask (ThreadPoolExecutor.java:895) [na: 1.6.0_41]
     at java.util.concurrent.ThreadPoolExecutor $ Worker.run (ThreadPoolExecutor.java:918) [na: 1.6.0_41]
     at java.lang.Thread.run (Thread.java:680) [na: 1.6.0_41]