Socko Web Server got java.lang.NullPointerException

Notes the solution for Socko Web Server getting NullPointerException.

Using socko-webserver 0.6.0 with scala 2.11.4

object AppServer extends App with Logger {
   val routes = Routes({
      case HttpRequest(httpRequest) => {
         httpRequest match {
            case _ => httpRequest.response.write(HttpResponseStatus.OK)
         }
      }
   })

   
   .....
}

Got the following exception

[nioEventLoopGroup-3-1] ERROR o.m.socko.webserver.RequestHandler - Exception caught in HttpRequestHandler
java.lang.NullPointerException: null
 at org.mashupbots.socko.webserver.RequestHandler.channelRead(RequestHandler.scala:128) ~[socko-webserver_2.11-0.6.0.jar:0.6.0]
 at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) [netty-all-4.0.23.Final.jar:4.0.23.Final]
 at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319) [netty-all-4.0.23.Final.jar:4.0.23.Final]
 at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86) [netty-all-4.0.23.Final.jar:4.0.23.Final]
 at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) [netty-all-4.0.23.Final.jar:4.0.23.Final]
 at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319) [netty-all-4.0.23.Final.jar:4.0.23.Final]
 at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) [netty-all-4.0.23.Final.jar:4.0.23.Final]
 at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) [netty-all-4.0.23.Final.jar:4.0.23.Final]
 at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319) [netty-all-4.0.23.Final.jar:4.0.23.Final]
 at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:163) [netty-all-4.0.23.Final.jar:4.0.23.Final]
 at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) [netty-all-4.0.23.Final.jar:4.0.23.Final]
 at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319) [netty-all-4.0.23.Final.jar:4.0.23.Final]
 at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:787) [netty-all-4.0.23.Final.jar:4.0.23.Final]
 at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:130) [netty-all-4.0.23.Final.jar:4.0.23.Final]
 at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511) [netty-all-4.0.23.Final.jar:4.0.23.Final]
 at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468) [netty-all-4.0.23.Final.jar:4.0.23.Final]
 at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382) [netty-all-4.0.23.Final.jar:4.0.23.Final]
 at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354) [netty-all-4.0.23.Final.jar:4.0.23.Final]
 at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116) [netty-all-4.0.23.Final.jar:4.0.23.Final]
 at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137) [netty-all-4.0.23.Final.jar:4.0.23.Final]
 at java.lang.Thread.run(Thread.java:745) [na:1.7.0_67]

Solution: DO NOT extends scala.App