Unhandled HttpException in Web Service

Hi,Recently I uploaded a web service to my ftp site(ftp://ftp.dotnetplatform.info.The web service is accessible at http://dotnetplatform.info/TranWebService/FinancialUtilSer.asmx. The web service has two web methods:"TransferMoney" and "GetAllAccountNumbers".I have got no problem invoking the first method-"TransferMoney" but I received an error message when I invoked the second method(GetAllAccountNumbers).The error message is as follows:System.Web.HttpException: Cannot execute transacted code.
at System.Web.Util.Transactions.InvokeTransacted(TransactedCallback callback, TransactionOption mode, Boolean& transactionAborted)
at System.Web.Util.Transactions.InvokeTransacted(TransactedCallback callback, TransactionOption mode)
at System.Web.Services.Protocols.WebServiceHandler.CoreProcessRequest()
So I am wondering if this was the error of the web service itself or on the server side.Thanks.