unicef.it - debug errors

https://my.unicef.it/mailing.aspx

by adding a non integer value we get an error with part of the code.
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Line 36:         if (cod != "codice donatore" && key != "codice personale")
Line 37:         {
Line 38:             string codiceDonor = autenticazione.getDonor(Int32.Parse(cod), key);
Line 39:             if (codiceDonor != "")
Line 40:             {
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https://my.unicef.it/RecuperaPassword.aspx
adding anything throws an error related to the captcha.
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ine 1433:    CaptchaANDQuestionResponse IService.CaptchaANDQuestion(CaptchaANDQuestionRequest request)
Line 1434:    {
Line 1435:        return base.Channel.CaptchaANDQuestion(request);
Line 1436:    }
Line 1437:   


Source File: f:\webroot\www.myunicef.it\App_Code\Source.cs    Line: 1435

Stack Trace:


[FaultException: The server was unable to process the request due to an internal error.  For more information about the error, either turn on IncludeExceptionDetailInFaults (either from ServiceBehaviorAttribute or from the <serviceDebug> configuration behavior) on the server in order to send the exception information back to the client, or turn on tracing as per the Microsoft .NET Framework 3.0 SDK documentation and inspect the server trace logs.]
   System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) +10267386
   System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) +539
   IService.CaptchaANDQuestion(CaptchaANDQuestionRequest request) +0
   ServiceClient.IService.CaptchaANDQuestion(CaptchaANDQuestionRequest request) in f:\webroot\www.myunicef.it\App_Code\Source.cs:1435
   ServiceClient.CaptchaANDQuestion(String UserName, Int32 ImageWidth, Int32 ImageHeight, Single FontSize, Int32 idn_ess, String& Question, String& Token, String& Error) in f:\webroot\www.myunicef.it\App_Code\Source.cs:1446
   RecuperaPassword.CaptchaEDomanda(String mail) in f:\webroot\www.myunicef.it\RecuperaPassword.aspx.cs:62
   RecuperaPassword.recPasw_Click(Object sender, EventArgs e) in f:\webroot\www.myunicef.it\RecuperaPassword.aspx.cs:109
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +115
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +140
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +29
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2981
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