远程服务器返回错误：（500）mvc中的内部服务器错误

Question

我收到错误消息The remote server returned an error: (500) Internal Server Error ，代码如下：

private object ViewProgramDetails(Func<string, JsonResult> GetPrograms,string epicid)
{
    try
    {
        var path = WebConfigurationManager.AppSettings["ProgramDetailsUrl"] + "?epicid=" + epicid;

        XElement elem = XElement.Load(path);

        var inputheaderdictionary = new Dictionary<string, string>();
        Dictionary<string, string> xmlDatadictionary = elem.Attributes().ToDictionary(attribute => attribute.Name.ToString().ToUpper(), attribute => attribute.Value);

        List<string> elementList = (from InputHeaderElements val in Enum.GetValues(typeof(InputHeaderElements)) select val.ToString().ToUpper()).ToList();

        foreach (string ele in elementList)
        {
            if (xmlDatadictionary.ContainsKey(ele))
            {
                try
                {
                    if (!ele.ToUpper().Equals("EPIC") && !ele.ToUpper().Equals("EEQU"))
                    {
                        inputheaderdictionary.Add(ele, xmlDatadictionary[ele]);
                    }
                }
                catch (Exception)
                {
                    //do nothing
                }
            }
        }

        var result = inputheaderdictionary.ToList();

        return Json(result, JsonRequestBehavior.AllowGet);
    }
    catch (Exception)
    {
        return Json(string.Empty);
    }
}

下面的行抛出异常：

XElement elem = XElement.Load(path);

我该如何解决该错误？ 或者至少对确切原因有一个更好的了解？