Getting error while creating test set

    testSet.setTestSetFolderId(316);

    testSet.setProjectId(11);

    testSet.setName("Test Set 26112016");

    testSet.setTestSetFolderId(9255);

    try {

      testSet = spira.testSet_Create(testSet);

      System.out.println("New TestSet created " + testSet.getTestSetId());

    }

    catch (RemoteException e) {

      e.printStackTrace();

    }

AxisFault

 faultCode: {http://schemas.microsoft.com/net/2005/12/windowscommunicationfoundation/dispatcher}InternalServiceFault

 faultSubcode: 

 faultString: Nullable object must have a value.

 faultActor: 

 faultNode: 

 faultDetail: 

{http://schemas.datacontract.org/2004/07/System.ServiceModel}ExceptionDetail:<HelpLink i:nil="true"/><InnerException i:nil="true"/><Message>Nullable object must have a value.</Message><StackTrace>   at System.Nullable`1.get_Value()

   at Inflectra.SpiraTest.Web.Services.v5_0.SoapService.TestSet_Create(RemoteTestSet remoteTestSet)

   at SyncInvokeTestSet_Create(Object , Object[] , Object[] )

   at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]&amp; outputs)

   at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc&amp; rpc)

   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc&amp; rpc)

   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc&amp; rpc)

   at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)</StackTrace><Type>System.InvalidOperationException</Type>

Nullable object must have a value.

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 org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)

at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknown Source)

at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)

at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)

at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)

at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)

at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)

at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)

at javax.xml.parsers.SAXParser.parse(SAXParser.java:392)

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 com.inflectra.www.SpiraTest.Services.v5_0.BasicHttpBinding_ISoapServiceStub.testSet_Create(BasicHttpBinding_ISoapServiceStub.java:12702)

at com.transcendsys.tools.ant.spira.TestArtifactRetrieval.testSet_Creation(TestArtifactRetrieval.java:129)

at com.transcendsys.tools.ant.spira.TestArtifactRetrieval.main(TestArtifactRetrieval.java:143)