[SNMP4J] Help: Unsupported PDU type

[通子]

My agent encount this error.


java.io.IOException: Unsupported PDU type: -96
        at org.snmp4j.PDU.decodeBER(Lorg.snmp4j.asn1.BERInputStream;)V(Unknown Source)
        at org.snmp4j.mp.MPv2c.prepareDataElements(Lorg.snmp4j.MessageDispatcher;Lorg.snmp4j.smi.Address;Lorg.snmp4j.asn1.BERInputStream;Lorg.snmp4j.smi.Integer32;Lorg.snmp4j.smi.Integer32;Lorg.snmp4j.smi.OctetString;Lorg.snmp4j.smi.Integer32;Lorg.snmp4j.MutablePDU;Lorg.snmp4j.mp.PduHandle;Lorg.snmp4j.smi.Integer32;Lorg.snmp4j.mp.StatusInformation;Lorg.snmp4j.mp.MutableStateReference;)I(Unknown Source)
        at org.snmp4j.MessageDispatcherImpl.dispatchMessage(Lorg.snmp4j.TransportMapping;Lorg.snmp4j.mp.MessageProcessingModel;Lorg.snmp4j.smi.Address;Lorg.snmp4j.asn1.BERInputStream;)V(Unknown Source)
        at org.snmp4j.MessageDispatcherImpl.processMessage(Lorg.snmp4j.TransportMapping;Lorg.snmp4j.smi.Address;Lorg.snmp4j.asn1.BERInputStream;)V(Unknown Source)
        at org.snmp4j.MessageDispatcherImpl.processMessage(Lorg.snmp4j.TransportMapping;Lorg.snmp4j.smi.Address;Ljava.nio.ByteBuffer;)V(Unknown Source)
        at org.snmp4j.transport.AbstractTransportMapping.fireProcessMessage(Lorg.snmp4j.smi.Address;Ljava.nio.ByteBuffer;)V(Unknown Source)
        at org.snmp4j.transport.DefaultUdpTransportMapping$ListenThread.run()V(Unknown Source)




who encounted too? why?