c# ConfigSection

Delam config section v app.configu



v app.configu imam

<configSections>
      <section name="AConfigSection" type="TestGJILoad.AConfigSection, TestGJILoad"/>
  </configSections>
  <AConfigSection>
    <UrlElement name="FCL1 oz kaj pa vem"  url="www.abc.com"/>
  </AConfigSection>

using System.Configuration;

namespace TestGJILoad
{
    public class UrlElement : ConfigurationElement
    {
        [ConfigurationProperty("name", IsRequired = true)]
        public string Name
        {
            get { return (string)this["name"]; }
            set { this["name"] = value; }
        }

        [ConfigurationProperty("url")]
        public string Url
        {
            get { return (string)this["url"]; }
            set { this["url"] = value; }
        }

    }

    public class AConfigSection : ConfigurationSection
    {
        [ConfigurationProperty("url")]
        public UrlElement AUrl
        {
            get { return (UrlElement)this["url"]; }
            set { this["url"] = value; }
        }
    }
}

to je nek class pač in v glavnem classu

 AConfigSection config = (AConfigSection)System.Configuration.ConfigurationManager.GetSection("AConfigSection");

Ta zadnja vrstica vrne Configuration system failed to initialize. Ali kdo opazi kako napako