what am i doing wrong

[srathin]

I'm getting the following error when i access a method in my webservice from
the aspx layer.Please help me understand. thanks

1) Exception Information
*********************************************
Exception Type: System.Web.Services.Protocols.SoapException
Actor:
Code: http://schemas.xmlsoap.org/soap/envelope/:Server
Detail: System.Xml.XmlElement
Message: System.Web.Services.Protocols.SoapException: Server was unable to
process request. ---> System.InvalidOperationException: There was an error
generating the XML document. ---> System.InvalidCastException: At least one
element in the source array could not be cast down to the destination array
type.
at System.Array.Copy(Array sourceArray, Int32 sourceIndex, Array
destinationArray, Int32 destinationIndex, Int32 length)
at System.Collections.ArrayList.ToArray(Type type)
at Qwest.DCP.DAO.Contracts.GetRCBSCodes(String Acronym) in
c:\dcp\dcpdao\contracts.cs:line 346
at Qwest.DCP.DAO.ApplicationDataResponse.get_RCBSCode() in
c:\dcp\dcpdao\applicationdataresponse.cs:line 59
at
Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriter1.Write6_ApplicationDataResponse(String
n, String ns, ApplicationDataResponse o, Boolean isNullable, Boolean needType)
at
Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriter1.Write52_getApplicationsResponse(Object[] p)
--- End of inner exception stack trace ---
at System.Xml.Serialization.XmlSerializer.Serialize(XmlWriter xmlWriter,
Object o, XmlSerializerNamespaces namespaces, String encodingStyle)
at System.Xml.Serialization.XmlSerializer.Serialize(XmlWriter xmlWriter,
Object o, XmlSerializerNamespaces namespaces)
at System.Web.Services.Protocols.SoapServerProtocol.WriteReturns(Object[]
returnValues, Stream outputStream)
at System.Web.Services.Protocols.WebServiceHandler.WriteReturns(Object[]
returnValues)
at System.Web.Services.Protocols.WebServiceHandler.Invoke()
--- End of inner exception stack trace ---
TargetSite: System.Object[]
ReadResponse(System.Web.Services.Protocols.SoapClientMessage,
System.Net.WebResponse, System.IO.Stream, Boolean)
HelpLink: NULL
Source: System.Web.Services

StackTrace Information
*********************************************
at
System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String
methodName, Object[] parameters)
at
Qwest.DCP.UI.SMVTService.SMVTracker.getApplications(ApplicationDataRequest
requestPms) in c:\inetpub\wwwroot\dcpui\web
references\smvtservice\reference.cs:line 227
at Qwest.DCP.UI.CreateSMVT.ddlApp_SelectedIndexChanged(Object sender,
EventArgs e) in c:\inetpub\wwwroot\dcpui\createsmvt.aspx.cs:line 340