"No http handler was found for request type 'POST'" error when deploying asp chart control in production server for website project

I have added asp chart controls in my website project and it has been working fine. But when I deploy it in production server and try to run in IIS 7, it throws an error "No http handler was found for request type 'POST'" and
[HttpException (0x80004005): No http handler was found for request type 'POST'] ................... [HttpException (0x80004005): Error executing child request for ChartImg.axd.] ..................... The website worked fine when there was no chart control. This is how my web.config file is:
<configuration> <appSettings> <add key="ChartImageHandler" value="storage=file;timeout=20;dir=c:\TempImageFiles\;"/> </appSettings> <connectionStrings> </connectionStrings> <system.web> <httpHandlers> <add path="ChartImg.axd" verb="GET,HEAD,POST" type="System.Web.UI.DataVisualization.Charting.ChartHtt ...