NPE in OFMessageEncoder

2015-10-21 11:30:43,216 | ERROR | w I/O worker #13 | OFChannelHandler | 166 - org.onosproject.onos-of-ctl - 1.4.0.SNAPSHOT | Error while processing message from switch org.onosproject.driver.handshaker.NiciraSwitchHandshaker [/10.211.55.3:39696 DPID[00:00:00:00:00:00:00:04]]state ACTIVE
java.lang.NullPointerException
at org.onosproject.openflow.controller.impl.OFMessageEncoder.encode(OFMessageEncoder.java:53)
at org.jboss.netty.handler.codec.oneone.OneToOneEncoder.doEncode(OneToOneEncoder.java:66)
at org.jboss.netty.handler.codec.oneone.OneToOneEncoder.handleDownstream(OneToOneEncoder.java:59)
at org.jboss.netty.channel.Channels.write(Channels.java:704)[44:org.jboss.netty:3.9.2.Final]
at org.jboss.netty.channel.Channels.write(Channels.java:671)[44:org.jboss.netty:3.9.2.Final]
at org.jboss.netty.channel.AbstractChannel.write(AbstractChannel.java:248)
at org.onosproject.openflow.controller.driver.AbstractOpenFlowSwitch.sendMsg(AbstractOpenFlowSwitch.java:108)
at org.onosproject.openflow.controller.driver.AbstractOpenFlowSwitch.transitionToMasterSwitch(AbstractOpenFlowSwitch.java:243)
at org.onosproject.openflow.controller.driver.AbstractOpenFlowSwitch.handleRole(AbstractOpenFlowSwitch.java:327)
at org.onosproject.openflow.controller.impl.OFChannelHandler$ChannelState$8.processOFRoleReply(OFChannelHandler.java:619)
at org.onosproject.openflow.controller.impl.OFChannelHandler$ChannelState.processOFMessage(OFChannelHandler.java:899)
at org.onosproject.openflow.controller.impl.OFChannelHandler.messageReceived(OFChannelHandler.java:1167)
at org.jboss.netty.handler.timeout.IdleStateAwareChannelHandler.handleUpstream(IdleStateAwareChannelHandler.java:36)[44:org.jboss.netty:3.9.2.Final]
at org.jboss.netty.handler.timeout.ReadTimeoutHandler.messageReceived(ReadTimeoutHandler.java:184)[44:org.jboss.netty:3.9.2.Final]
at org.jboss.netty.handler.timeout.IdleStateHandler.messageReceived(IdleStateHandler.java:294)[44:org.jboss.netty:3.9.2.Final]
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:296)[44:org.jboss.netty:3.9.2.Final]
at org.jboss.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:462)[44:org.jboss.netty:3.9.2.Final]
at org.jboss.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:443)[44:org.jboss.netty:3.9.2.Final]
at org.jboss.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:303)[44:org.jboss.netty:3.9.2.Final]
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)[44:org.jboss.netty:3.9.2.Final]
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)[44:org.jboss.netty:3.9.2.Final]
at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88)[44:org.jboss.netty:3.9.2.Final]
at org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:108)[44:org.jboss.netty:3.9.2.Final]
at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:318)
at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89)[44:org.jboss.netty:3.9.2.Final]
at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)[44:org.jboss.netty:3.9.2.Final]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[:1.8.0_45]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[:1.8.0_45]
at java.lang.Thread.run(Thread.java:745)[:1.8.0_45]