Server Error in '/' Application.

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:


Line 437:            global.error_mailer("Gallery | " + ConfigurationManager.AppSettings["site_name"] + " (Populate album name dropdownlist)", HttpContext.Current.Request.ServerVariables["URL"], error.Message, error.Source, error.StackTrace);
Line 438:        }
Line 439:        if (!IsPostBack && album_directory.Length > 0) gallery_album_name_dropdownlist.Items.FindByValue(album_directory.ToString()).Selected = true;
Line 440:    }
Line 441:}

Source File: d:\Web Sites\south_downs_siegebreakers\gallery.aspx.cs    Line: 439

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   gallery.populate_album_name_dropdownlist() in d:\Web Sites\south_downs_siegebreakers\gallery.aspx.cs:439
   gallery.populate_fields() in d:\Web Sites\south_downs_siegebreakers\gallery.aspx.cs:113
   gallery.Page_Load(Object sender, EventArgs e) in d:\Web Sites\south_downs_siegebreakers\gallery.aspx.cs:32
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +52
   System.Web.UI.Control.OnLoad(EventArgs e) +97
   System.Web.UI.Control.LoadRecursive() +61
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +693


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4700.0