Object reference not set to an instance of an object.

Hi,

I am using sitefinity 5.0. I wanted to edit a custom template a bit.
While doing this, I only duplicated a sitemap control on my template and unfortunately saved before previewing the results.

Can anyone please look into matter.
I'm going through this error below:


Server Error in '/' Application.

Object reference not set to an instance of an object.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.NullReferenceException: Object reference not set to an instance of an object.

Source Error: 

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace: 

[NullReferenceException: Object reference not set to an instance of an object.]
Telerik.Sitefinity.Web.UI.ZoneEditor.DescribeComponent(IScriptDescriptor descriptor) +2570
Telerik.Web.UI.RadWebControl.Telerik.Web.IControl.DescribeComponent(IScriptDescriptor descriptor) +10
Telerik.Web.UI.ScriptRegistrar.GetScriptDescriptors(Control control) +119
Telerik.Web.UI.RadWebControl.GetScriptDescriptors() +4
Telerik.Web.UI.RadWebControl.System.Web.UI.IScriptControl.GetScriptDescriptors() +10
System.Web.UI.ScriptControlManager.RegisterScriptDescriptors(IScriptControl scriptControl) +128
Telerik.Web.UI.RadWebControl.RegisterScriptDescriptors() +90
Telerik.Web.UI.RadWebControl.Render(HtmlTextWriter writer) +83
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +208
System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +173
System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +31
System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output) +53
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100
System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +40
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +208
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +8
System.Web.UI.Control.Render(HtmlTextWriter writer) +10
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +208
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +8
System.Web.UI.Page.Render(HtmlTextWriter writer) +29
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3060



Many Thanks