title: What is the error "The method or operation is not implemented." in nopCommerce plugin during installing a new plugin
body: <p>I am working on nopCommerce CMS. I created my own plugin and want to install it via Admin panel. I successfully created the plugin and it is showing in admin panel under Local Plugin section. When I am trying to install it, I am getting error "The method or operation is not implemented.". Can any one tell me what am I missing.</p>
  
  <p>Please find the code below that I write to install :</p>
  
  <pre><code>private readonly ISettingService _settingService;
  
      public AdminInvoicePlugin(ISettingService settingService)
      {
          this._settingService = settingService;
      }
  
      public void GetConfigurationRoute(out string actionName, out string controllerName, out System.Web.Routing.RouteValueDictionary routeValues)
      {
          actionName = "Configure";
          controllerName = "InvoiceAdmin";
          routeValues = new RouteValueDictionary { { "Namespaces",     "Shopfast.Plugin.Invoice.Admin.Controllers" }, { "area", null } };
      }
  
     void IPlugin.Install()
      {
          base.Install();
      }
  
      PluginDescriptor IPlugin.PluginDescriptor
      {
          get
          {
              throw new NotImplementedException();
          }
          set
          {
              throw new NotImplementedException();
          }
      }
  
      void IPlugin.Uninstall()
      {
          base.Uninstall();
      }
  </code></pre>