<Error encoding object: java.lang.IllegalArgumentException: null> in server side

[kidysnoopy]

Issue

Short description

When we use [org.red5.server.so.SharedObject.sendMessage()」function to send data of ByteArray to client in the red5 server,
sometimes it shows [ERROR o.r.s.n.r.codec.RTMPProtocolEncoder - Error encoding object: java.lang.IllegalArgumentException: null] in red5.log file
Could you please help check how to solve this problem?

Environment

[] Operating system and version: Red Hat Enterprise Linux５
[] Java version: jdk1.6.0_30
[] Red5 version: Red5 Server 1.0.1 $Rev: 4450 $
[] Client Version: ActionScript 4.0
[] AMF Version: AMF3

Code

public void setBackgroundImage(ByteArray backgroudImage, int width, int height) {
	// call flash function
	List<Object> arguments = new ArrayList<Object>();
	arguments.add(backgroudImage);
	arguments.add(width);
	arguments.add(height);
	whiteBoardSO.sendMessage("setBackgroundImage", arguments);
}

Logs

[SharedObjectThread-2] ERROR o.r.s.n.r.codec.RTMPProtocolEncoder - Error encoding object:
java.lang.IllegalArgumentException: null
at java.nio.Buffer.position(Buffer.java:216) ~[na:1.6.0_30]
at java.nio.HeapByteBuffer.get(HeapByteBuffer.java:129) ~[na:1.6.0_30]
at org.apache.mina.core.buffer.AbstractIoBuffer.get(AbstractIoBuffer.java:615) ~[mina-core-2.0.7.jar:na]
at org.apache.mina.core.buffer.AbstractIoBuffer.get(AbstractIoBuffer.java:1321) ~[mina-core-2.0.7.jar:na]
at org.red5.io.amf3.Output.writeByteArray(Output.java:534) ~[red5-server-1.0.jar:na]
at org.red5.io.object.Serializer.serialize(Serializer.java:80) ~[red5-server-1.0.jar:na]
at org.red5.io.object.Serializer.serialize(Serializer.java:60) ~[red5-server-1.0.jar:na]
at org.red5.server.net.rtmp.codec.RTMPProtocolEncoder.doEncodeSharedObject(RTMPProtocolEncoder.java:691) ~[red5-server-1.0.jar:na]
at org.red5.server.net.rtmp.codec.RTMPProtocolEncoder.encodeFlexSharedObject(RTMPProtocolEncoder.java:597) ~[red5-server-1.0.jar:na]
at org.red5.server.net.rtmp.codec.RTMPProtocolEncoder.encodeMessage(RTMPProtocolEncoder.java:543) ~[red5-server-1.0.jar:na]
at org.red5.server.net.rtmp.codec.RTMPProtocolEncoder.encodePacket(RTMPProtocolEncoder.java:147) ~[red5-server-1.0.jar:na]
at org.red5.server.net.rtmp.codec.RTMPProtocolEncoder.encode(RTMPProtocolEncoder.java:119) ~[red5-server-1.0.jar:na]
at org.red5.server.net.rtmp.codec.RTMPMinaProtocolEncoder.encode(RTMPMinaProtocolEncoder.java:48) [red5-server-1.0.jar:na]
at org.apache.mina.filter.codec.ProtocolCodecFilter.filterWrite(ProtocolCodecFilter.java:308) [mina-core-2.0.7.jar:na]
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callPreviousFilterWrite(DefaultIoFilterChain.java:482) [mina-core-2.0.7.jar:na]
at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1400(DefaultIoFilterChain.java:47) [mina-core-2.0.7.jar:na]
at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.filterWrite(DefaultIoFilterChain.java:775) [mina-core-2.0.7.jar:na]
at org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.filterWrite(DefaultIoFilterChain.java:705) [mina-core-2.0.7.jar:na]
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callPreviousFilterWrite(DefaultIoFilterChain.java:482) [mina-core-2.0.7.jar:na]
at org.apache.mina.core.filterchain.DefaultIoFilterChain.fireFilterWrite(DefaultIoFilterChain.java:475) [mina-core-2.0.7.jar:na]
at org.apache.mina.core.session.AbstractIoSession.write(AbstractIoSession.java:494) [mina-core-2.0.7.jar:na]
at org.apache.mina.core.session.AbstractIoSession.write(AbstractIoSession.java:439) [mina-core-2.0.7.jar:na]
at org.red5.server.net.rtmp.RTMPMinaConnection.write(RTMPMinaConnection.java:308) [red5-server-1.0.jar:na]
at org.red5.server.net.rtmp.Channel.write(Channel.java:136) [red5-server-1.0.jar:na]
at org.red5.server.net.rtmp.Channel.write(Channel.java:105) [red5-server-1.0.jar:na]
at org.red5.server.net.rtmp.RTMPConnection.sendSharedObjectMessage(RTMPConnection.java:983) [red5-server-1.0.jar:na]
at org.red5.server.so.SharedObject$1.run(SharedObject.java:332) [red5-server-1.0.jar:na]
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [na:1.6.0_30]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [na:1.6.0_30]
at java.lang.Thread.run(Thread.java:662) [na:1.6.0_30]