Помогите, пожалуйста с проблемой. Не могу понять, что не так.

пишу на Java вот токай код

PostMessageInfo[] pmi = new PostMessageInfo[1];
pmi[0] = new PostMessageInfo(1,0,43,"test","test");

PostRequest pr = new PostRequest();
pr.setUserName(_user_name);
pr.setPassword(_password);

pr.setWritedMessages(pmi);

jatsoap.postChange(pr);

PostResponse postresponse = jatsoap.postChangeCommit();

до строки jatsoap.postChange(pr) все работает нормально, когда он пытается подтвердит изменения вылетает вот такой вот exception:

AxisFault
faultCode: {http://schemas.xmlsoap.org/soap/envelope/}Server
faultSubcode:
faultString: Server was unable to process request. ---> Fatal error: PostRequest is Null.
faultActor:
faultNode:
faultDetail:
{http://xml.apache.org/axis/}stackTrace:Server was unable to process request. ---> Fatal error: PostRequest is Null.
at org.apache.axis.message.SOAPFaultBuilder.createFault(SOAPFaultBuilder.java:222)
at org.apache.axis.message.SOAPFaultBuilder.endElement(SOAPFaultBuilder.java:129)
at org.apache.axis.encoding.DeserializationContext.endElement(DeserializationContext.java:1087)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
at javax.xml.parsers.SAXParser.parse(Unknown Source)
at org.apache.axis.encoding.DeserializationContext.parse(DeserializationContext.java:227)
at org.apache.axis.SOAPPart.getAsSOAPEnvelope(SOAPPart.java:696)
at org.apache.axis.Message.getSOAPEnvelope(Message.java:435)
at org.apache.axis.handlers.soap.MustUnderstandChecker.invoke(MustUnderstandChecker.java:62)
at org.apache.axis.client.AxisClient.invoke(AxisClient.java:206)
at org.apache.axis.client.Call.invokeEngine(Call.java:2784)
at org.apache.axis.client.Call.invoke(Call.java:2767)
at org.apache.axis.client.Call.invoke(Call.java:2443)
at org.apache.axis.client.Call.invoke(Call.java:2366)
at org.apache.axis.client.Call.invoke(Call.java:1812)
at ru.rsdn.Janus.JanusATSoapStub.postChangeCommit(JanusATSoapStub.java:622)
at ru.bazon.jbazonanus.web.Actions.sendMessage(Actions.java:181)
at ru.bazon.jbazonanus.Start.main(Start.java:39)