Unable to Refresh Worklist using K2ROM

Hi

I'm trying to search the worklist using K2ROM. If I call Refresh method on the worklist, I'm getting an exception with the following error message: "Invalid archive type"..


Code:

string redirectUrl = String.Empty;
string k2ServerName = String.Empty;

SourceCode.K2ROM.Connection k2Conn = new SourceCode.K2ROM.Connection();

try
{
SourceCode.K2ROM.Worklist currentWorklist;
SourceCode.K2ROM.WorklistItem currentWorklistItem;
SourceCode.K2ROM.WorklistCriteria oWorklistCriteria = new SourceCode.K2ROM.WorklistCriteria();

//Retrieving the server name from config file
k2ServerName = ConfigurationSettings.AppSettings["DeploymentK2Server"];

//Opening the connection to k2 server
k2Conn.Open(k2ServerName, "[;];Authentication=Windows");
//Setting up the criteria for worklist search
oWorklistCriteria.Platform="ASP";

//This sets the filter for CurrentProcessID Datafield
oWorklistCriteria.AddFilterField(SourceCode.K2ROM.WCLogical.And, SourceCode.K2ROM.WCField.ProcessData,
"IPCNavigationID", SourceCode.K2ROM.WCCompare.Equal, pK2NavigationID);

//Add Sort Order
oWorklistCriteria.AddSortField(SourceCode.K2ROM.WCField.ProcessStartDate,
SourceCode.K2ROM.WCSortOrder.Descending);

//Populate Custom Worklist
currentWorklist = k2Conn.OpenWorklist(oWorklistCriteria);

//If the worklist item is not found, we refresh the worklist.
if(currentWorklist.Count == 0)
{
int i = 0;
while(i < 10)
{
currentWorklist.Refresh(); //Exception is thrown at this point
if (currentWorklist.Count > 0)
{ break;
}
i++;
}
}

//We are expecting a single item in the result, hence select the first
//item

if (currentWorklist.Count > 0)
{
currentWorklistItem = currentWorklist[0];
redirectUrl = currentWorklistItem.Data;
}

}
catch(Exception ex)
{
throw ex;
}
finally
{
k2Conn.Close();
}

return redirectUrl;