Value cannot be null or empty.<br>Parameter name: handler

Server Error in '/' Application.

Value cannot be null or empty.
Parameter name: handler

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.ArgumentException: Value cannot be null or empty.
Parameter name: handler

Source Error:

The source code that generated this unhandled exception can only be shown when compiled in debug mode. To enable this, please follow one of the below steps, then request the URL:

1. Add a "Debug=true" directive at the top of the file that generated the error. Example:

  <%@ Page Language="C#" Debug="true" %>

or:

2) Add the following section to the configuration file of your application:

<configuration>
   <system.web>
       <compilation debug="true"/>
   </system.web>
</configuration>

Note that this second technique will cause all files within a given application to be compiled in debug mode. The first technique will cause only that particular file to be compiled in debug mode.

Important: Running applications in debug mode does incur a memory/performance overhead. You should make sure that an application has debugging disabled before deploying into production scenario.

Stack Trace: 


[ArgumentException: Value cannot be null or empty.
Parameter name: handler]
   System.Web.UI.ScriptComponentDescriptor.AddEvent(String name, String handler) +512367
   AjaxControlToolkit.ScriptObjectBuilder.DescribeComponent(Object instance, ScriptComponentDescriptor descriptor, IUrlResolutionService urlResolver, IControlResolver controlResolver) +1469
   AjaxControlToolkit.ExtenderControlBase.RenderScriptAttributes(ScriptBehaviorDescriptor descriptor) +46
   AjaxControlToolkit.ExtenderControlBase.GetScriptDescriptors(Control targetControl) +191
   System.Web.UI.ExtenderControl.System.Web.UI.IExtenderControl.GetScriptDescriptors(Control targetControl) +17
   System.Web.UI.ScriptControlManager.RegisterScriptDescriptors(IExtenderControl extenderControl) +255
   System.Web.UI.ExtenderControl.Render(HtmlTextWriter writer) +85
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +79
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +250
   System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +47
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +79
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +250
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +79
   ASP.review_readproduct_php.__RenderdvFB_blogs_search(HtmlTextWriter __w, Control parameterContainer) +85
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +117
   System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +47
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +79
   ASP.review_readproduct_php.__RenderContent1(HtmlTextWriter __w, Control parameterContainer) +6131
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +117
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +79
   ASP.includes_master_headerfooter_new_master.__RenderContentHomeHeaderFooter(HtmlTextWriter __w, Control parameterContainer) +8967
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +117
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +79
   ASP.includes_master_empty_master.__RenderMasterForm(HtmlTextWriter __w, Control parameterContainer) +1946
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +117
   System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +11836097
   System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +47
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +79
   System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +50
   ASP.includes_master_empty_master.__Render__control1(HtmlTextWriter __w, Control parameterContainer) +318
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +117
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +79
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +250
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +79
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +250
   System.Web.UI.Page.Render(HtmlTextWriter writer) +39
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +79
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +8753

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.4087.0