the name does not exist in the current context

 im getting a weird message ive never seen before..
Compiler Error Message: CS0103: The name 'UserComponent' does not exist in the current context
im trying to call a class thats held in App_Data..never had any problems before trying to call a class...any idea why im getting this weird message?

        protected void Page_Load(object sender, EventArgs e)
        {
            if (IsPostBack)
                return;
                GetUser(HttpContext.Current.Request.ServerVariables["LOGON_USER"]);
           
        }
 &n ...