Hi Meenakshi Nagalingam,
This error means that the chart image cannot be served correctly. Sometimes the reason is in incorrect chart http handler registration. The HttpHandler registration differs for different versions of IIS, this is discussed in more details in this help topic
. However, some of the charts appear, so it seems this might not be the reason in this case.
Still, I am a bit puzzled - does the page behave in the same way in your dev environment and when deployed? Showing only some of the images usually happens in web farm environment -- the explanation here is this: the page is served by one machine, which generates the chart image and puts it into the Session. Then the request for the image is served by another machine and it cannot find the image - hence the error message.
The solution for web farm environment would be to implement State server or SQL server session state mode
or sticky sessions, ensuring that all the request from one user will be handled by the same server.
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