I am developing bacnet client application. But sometimes the exception throw
java.lang.NullPointerException
at com.serotonin.bacnet4j.type.Encodable.writeEncodable(Encodable.java:270)
at com.serotonin.bacnet4j.service.acknowledgement.ReadPropertyAck.write(ReadPropertyAck.java:79)
at com.serotonin.bacnet4j.npdu.ip.IpMessageControl.sendResponse(IpMessageControl.java:239)
at com.serotonin.bacnet4j.npdu.ip.IpMessageControl.access$300(IpMessageControl.java:74)
at com.serotonin.bacnet4j.npdu.ip.IpMessageControl$IncomingMessageExecutor.runImpl(IpMessageControl.java:538)
at com.serotonin.bacnet4j.npdu.ip.IpMessageControl$IncomingMessageExecutor.run(IpMessageControl.java:456)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
But client is working. What is the message mean? How can ? correct it?