i have done the same

it works in one application on the system

but on other application in the same system it gives "object ref error....................."

 

i even copied the code given by u on a new page but in this second application i get the same error

 

System.NullReferenceException was unhandled by user code
  Message="Object reference not set to an instance of an object."
  Source="CuteEditor"
  StackTrace:
       at CuteEditor.Impl.b..ctor(Type type, String key)
       at CuteEditor.Impl.d.a(Type A_0, String A_1)
       at CuteEditor.Editor.a.a.i(HtmlTextWriter A_0)
       at CuteEditor.Editor.Render(HtmlTextWriter writer)
       at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
       at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)
       at System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
       at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
       at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
       at System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer)
       at System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output)
       at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
       at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)
       at System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer)
       at ASP.mail_send_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in D:\crmpark\crmpark\mail_send.aspx:line 189
       at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
       at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
       at System.Web.UI.Page.Render(HtmlTextWriter writer)
       at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
       at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)
       at System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
       at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)