WCF passing null as object of class

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ASP.NET

WCF

I have a wcf web service which i am calling from my asp.net code, but its giving me an error because i am not passing one object of class. how to handle this?


protected void btnSubmit_Click(object sender, EventArgs e)
{
/*This section is not working as i am not passing ts.txnErrorDetails */

bool b;
            PolicyUpdate.ServiceClient req = new PolicyUpdate.ServiceClient();
            PolicyUpdate.TxnStatus ts = new PolicyUpdate.TxnStatus();
            ts.TxnId = "1";
            ts.Status = "Success";
            ts.TxnStatusDetail = new PolicyUpdate.TxnDetail { ContactId = 111111111, PolicyNo = 925101789012340000, ProposalNo = 12345678901234, ReceiptNo = 123456789123 };
            
            b = req.UpdateStatus(ts);

/* This section is working as i am passing ts.txnErrorDetails*/

ts.TxnId = "1";
          ts.Status = "UW";
          ts.TxnStatusDetail = new PolicyUpdate.TxnDetail { ContactId = 111111111, ProposalNo = 12345678901234, ReceiptNo = 123456789123 };
          ts.TxnErrorDetails = new PolicyUpdate.ErrorDetail { ErrorLevel = "Policy", Details = "Proposal Pending for UW Approval" };
          b = req.UpdateStatus(ts);

}