DWR is undefined

[ThomasChris]

I used DWR in my project. When I run it in local it works well. But when I run it in net it shows "dwr is undefined". At first for sometime it was working very well. Suddenly this error comes out.
when I see http://servername/WEBAPP/dwr/ it shows that Page Not Found Error.
What could be the problem. Is there anything to set for DWR in internet

The web.xml and dwr.xml files done properly. The project works well in local tomcat.
When i used it in server it is not wrking.