how to change virtual directory

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ASP.NET

I have an webapplication.

In a class file i have written this code

string logFile = "App_Data/ErrorLog.txt";
logFile = HttpContext.Current.Server.MapPath(logFile);

And in global.asax page I have written on event of application_error.

Exception exc = Server.GetLastError();
if (exc.GetType() == typeof(HttpException))
            {
                // The Complete Error Handling Example generates
                // some errors using URLs with "NoCatch" in them;
                // ignore these here to simulate what would happen
                // if a global.asax handler were not implemented.
                if (exc.Message.Contains("NoCatch") || exc.Message.Contains("maxUrlLength"))
                    return;

                //Redirect HTTP errors to HttpError page
                Server.Transfer("HttpErrorPage.aspx");
            }

At the position of Exception exc = Server.GetLastError(); it gives error.

It is an error to use a section registered as allowDefinition='MachineToApplication' beyond application level. This error can be caused by a virtual directory not being configured as an application in IIS. (C:\Documents and Settings\Pankaj_singh\My Documents\Visual Studio 2008\Projects\SPH11\images\web.config line 75)
at System.Configuration.ConfigurationSchemaErrors.


But my virtual directory path upto C:\Documents and Settings\Pankaj_singh\My Documents\Visual Studio 2008\Projects\SPH11
then also it shows upto C:\Documents and Settings\Pankaj_singh\My Documents\Visual Studio 2008\Projects\SPH11\images
path.

Please give me solution for that.

Thanks in advance