IllegalStateException in FrameDecoder

[Abraham Menacherry]

Hi,

I am sometimes getting the following exception while decoding a binary
packet. Can somebody explain root cause of this exception?

2011-05-26 16:26:40,687 51 ERROR netty.DefaultHandler Exception occurred in
Default Handler: 
java.lang.IllegalStateException: decode() method must read at least one byte
if it returned a frame (caused by: class
com.appcapture.buildingmgr.netty.DeviceProtocolMultiplexer)
	at
org.jboss.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:294)
	at
org.jboss.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:216)
	at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:274)
	at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:261)
	at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:350)
	at
org.jboss.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:281)
	at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:201)
	at
org.jboss.netty.util.internal.IoWorkerRunnable.run(IoWorkerRunnable.java:46)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:619)

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