ASP.Net MS Chart Control: The temp directory in chart handler configuration is not accessible

Hi,

     I am using MS Chart Control in my Web App,after some time I got the issue "The temp directory in chart handler configuration is not accessible" in Live App,even though my web.Config file is containing every thing related to charts like...

Please help me in this reg as soon as possible,thanks.

<add key="ChartImageHandler" value="storage=file;timeout=20;" /> under <appSettings>

<add path="ChartImg.axd" verb="GET,HEAD,POST" type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler, System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
       validate="false" /> under <httpHandlers>

 <add tagPrefix="asp" namespace="System.Web.UI.DataVisualization.Charting"
         assembly="System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" /> under <controls>

 

<add name="ChartImageHandler" preCondition="integratedMode" verb="GET,HEAD,POST"
       path="ChartImg.axd" type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler, System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" /> under  <handlers>.