[jboss-as7-dev] JBAS010985: unrecognized type 36

On a recent build I see these in the logs : [Server:server-one] Caused by: java.io.IOException: JBAS010985: unrecognized type 36 [Server:server-one] at org.jboss.as.protocol.mgmt.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:110) [jboss-as-protocol-7.1.0.Final-SNAPSHOT.jar:7.1.0.Final-SNAPSHOT] Any ideas what might be causing this?