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Error writing XML for first time on APP_DATA

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I have a issue deploying a MCMS based webapplication which is developed in 2.0 on the Production box, the issue is :There is a customized
configuration XML which is residing under the app_data of the application and
I have written a code for Write certain root names of that custom XML on the
Application start up on Global.asax.cs file to override certain Root Names
when the application starts up it works fine on the Development Machines but
when put on to the Production box it Shows an Error page for the first time
when the home page gets loaded and after that it works fine and the same
scenario does not brings any issue on the Development Machine, its just I am
rewriting Custom XML File on the App_Data folder, is there anything which
needs to be done on the WebServer or the Configuration ? Following is the
code I am using to Update the XML file on the App_data of the Application
written on Application_Start of global.asax.cs

System.Web.HttpContext httpContext = System.Web.HttpContext.Current;
string strFilePath =
System.Web.HttpContext.Current.Request.Application Path;
string strNewFile;
strFilePath += "/App_Data/";
strNewFile = strFilePath + "CustomWebConfig.xml";
string strReplace =
System.Configuration.ConfigurationManager.AppSetti ngs["root_channel_name"];
strReplace = "/" + strReplace + "/";

XmlDocument xmlDoc = new XmlDocument();
XmlDocument xmlDocNew = new XmlDocument();

xmlDoc.Load(httpContext.Server.MapPath(strFilePath +

XmlNodeList nodeList = xmlDoc.SelectNodes("Key/Keys");

for (int i = 0; i < nodeList.Count - 1; i++)
nodeList[i].Attributes["Value"].Value =
nodeList[i].Attributes["Value"].Value.Replace("/{-1}/", strReplace);
xmlDoc.Save(httpContext.Server.MapPath(strNewFile) );

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