404 error in production server

My GWT app works fine in hosted mode but I get 404 error in tomcat
production server. I'm hosting the app in a remote server so I don't
have the access to server log.

Annotation used in service class:
@RemoteServiceRelativePath("servlet/dash")

web.xml configuration:

<servlet>
<servlet-name>serve</servlet-name>
<servlet-class>com.mukundPackaging.server.DashBoardServiceImpl</
servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>serve</servlet-name>
<url-pattern>/com.mukundPackaging.DashBoard/servlet/dash</url-
pattern>
</servlet-mapping>

the error I get is:
404
not found
The requested URL /com.mukundPackaging.DashBoard/servlet/dash was not
found on this server.

Please help.
Thanks in advance

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