Attempting to retrieve all queueitems from a given queue causes NullReferenceException

Hi,

We are attempting to write a dashboard/console page for our Dynamics CRM 4 implementation.  As part of this we are trying to display all the emails in our "Support" queue in a GridView control.  Unforuntately everytime we attempt to run the retrievemultiple request on the queueitems we want CRM throws a platform error.  The tracelog shows it to be a NullReferenceException.  We know the GUID for the support queue is correct (contained in the support.queueid.Value attribute).  The request is running under my credentials, and I have administrator access to the system.

Anyone know something that could point me in the right direction to solve this?  Code sample and tracelog below.
Code Sample:
 
            //Fetch data from CRM
            QueryByAttribute queueQuery = new QueryByAttribute();
            queueQuery.EntityName = EntityName.queueitem.ToString();
            queueQuery.Attributes = new string[] { "queueid" };
 
            Lookup supportQueue = new Lookup(EntityName.queue.ToString(), support.queueid.Value);
 
            queueQuery.Values = new Lookup[] { supportQueue };
            queueQuery.ColumnSet = new ColumnSet(new string[] { "objecttypecode", "objectid", "queueitemid" });
 
            BusinessEntityCollection bec;
 
            try
            {
                bec = service.RetrieveMultiple(queueQuery);
            }
            catch (SoapException SoEx)
            {
                throw new Exception("Multiple Request Failure 1: " + SoEx.Detail.InnerText);
            }
 
-----
Tracelog:
 
[2009-07-06 13:55:48.7] Process: w3wp |Organization:e4dc1a83-46ba-4557-9843-35e9861795c8 |Thread:   20 |Category: Platform |User: 486abca3-a334-dd11-ae75-0019bbd1721a |Level: Error | MessageProcessor.Execute
	at MessageProcessor.Execute(PipelineExecutionContext context)
	at InternalMessageDispatcher.Execute(PipelineExecutionContext context)
	at ExternalMessageDispatcher.Execute(String messageName, Int32 primaryObjectTypeCode, Int32 secondaryObjectTypeCode, PropertyBag fields, CorrelationToken correlationToken, CallerOriginToken originToken, UserAuth userAuth, Guid callerId)
	at CrmServiceInternal.RetrieveMultiple(String namespaceName, QueryBase query, CorrelationToken correlationToken, CallerOriginToken originToken, UserAuth userAuth, Guid callerId)
	at CrmService.RetrieveMultiple(QueryBase query)
	at RuntimeMethodHandle._InvokeMethodFast(Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner)
	at RuntimeMethodHandle.InvokeMethodFast(Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner)
	at RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
	at RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
	at LogicalMethodInfo.Invoke(Object target, Object[] values)
	at WebServiceHandler.Invoke()
	at WebServiceHandler.CoreProcessRequest()
	at SyncSessionlessHandler.ProcessRequest(HttpContext context)
	at CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
	at HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
	at ApplicationStepManager.ResumeSteps(Exception error)
	at HttpApplication.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData)
	at HttpRuntime.ProcessRequestInternal(HttpWorkerRequest wr)
	at HttpRuntime.ProcessRequestNoDemand(HttpWorkerRequest wr)
	at ISAPIRuntime.ProcessRequest(IntPtr ecb, Int32 iWRType)
>MessageProcessor fail to process message 'RetrieveMultiple' for 'queueitem'.
[2009-07-06 13:55:48.7] Process: w3wp |Organization:e4dc1a83-46ba-4557-9843-35e9861795c8 |Thread:   20 |Category: Platform.Sdk |User: 486abca3-a334-dd11-ae75-0019bbd1721a |Level: Error | CompositeSoapExtensionExceptionHandler.Handle
	at CompositeSoapExtensionExceptionHandler.Handle(Stream to, Stream from, Exception exception)
	at CrmAuthenticationSoapExtensionBase.ProcessMessage(SoapMessage message)
	at SoapMessage.RunExtensions(SoapExtension[] extensions, Boolean throwOnException)
	at SoapServerProtocol.WriteException(Exception e, Stream outputStream)
	at WebServiceHandler.WriteException(Exception e)
	at WebServiceHandler.Invoke()
	at WebServiceHandler.CoreProcessRequest()
	at SyncSessionlessHandler.ProcessRequest(HttpContext context)
	at CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
	at HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
	at ApplicationStepManager.ResumeSteps(Exception error)
	at HttpApplication.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData)
	at HttpRuntime.ProcessRequestInternal(HttpWorkerRequest wr)
	at HttpRuntime.ProcessRequestNoDemand(HttpWorkerRequest wr)
	at ISAPIRuntime.ProcessRequest(IntPtr ecb, Int32 iWRType)
>CrmSoapExtension detected non-CrmException - report will be sent to Watson:
System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.Crm.Query.ConditionExpression..ctor(AttributeMetadata attribute, ConditionOperator conditionOperator, Array values, Boolean isCustom, Guid organizationId)
   at Microsoft.Crm.Query.EntityExpression.FromQueryVisitor.Visit(QueryByAttribute query)
   at Microsoft.Crm.Sdk.Query.QueryByAttribute.Accept(IQueryVisitor visitor)
   at Microsoft.Crm.Query.EntityExpression..ctor(QueryBase query, DynamicMetadataCache dynamicCache, Guid organizationId)
   at Microsoft.Crm.Query.EntityExpression.Converter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value)
   at Microsoft.Crm.BusinessEntities.ConversionHelpers.Convert(ICrmConversionContext conversionContext, Object source, Type destinationType)
   at Microsoft.Crm.Sdk.DictionaryMapper.Map(PropertyBag inputs, ICrmConversionContext context)
   at Microsoft.Crm.Extensibility.InternalOperationPlugin.Execute(IPluginExecutionContext context)
   at Microsoft.Crm.Extensibility.PluginStep.Execute(PipelineExecutionContext context)
   at Microsoft.Crm.Extensibility.Pipeline.Execute(PipelineExecutionContext context)
   at Microsoft.Crm.Extensibility.MessageProcessor.Execute(PipelineExecutionContext context)
   at Microsoft.Crm.Extensibility.InternalMessageDispatcher.Execute(PipelineExecutionContext context)
   at Microsoft.Crm.Extensibility.ExternalMessageDispatcher.Execute(String messageName, Int32 primaryObjectTypeCode, Int32 secondaryObjectTypeCode, PropertyBag fields, CorrelationToken correlationToken, CallerOriginToken originToken, UserAuth userAuth, Guid callerId)
   at Microsoft.Crm.Sdk.CrmServiceInternal.RetrieveMultiple(String namespaceName, QueryBase query, CorrelationToken correlationToken, CallerOriginToken originToken, UserAuth userAuth, Guid callerId)
   at Microsoft.Crm.Sdk.Crm2007.CrmService.RetrieveMultiple(QueryBase query)

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GGUserAsked:
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rakeshAgarwalCommented:
just try this out

queueQuery.Values = new string[] { support.queueid.Value};
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GGUserAuthor Commented:
That's done it, once I changed the code to get around a bug in the SDK.

Thank you!
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