.NET 3.5 chart controls exception: Error executing child request for ChartImg.axd

Question

Anyone getting this error when using the new free chart controls MS bought from Dundas?

\"Error executing child request for ChartImg.axd\"

On the MSDN forum

Answer 1

I posted a way I fixed this problem on the MSDN forum:

Well I still don't know why I was getting the exception but I seem to have found a workaround. I did an experiment where I took the supposed offending web.config and copied it to a new project where I added a new web form and chart control and the chart control rendered fine with the "UseHttpHandler" option. This led me to believe that it wasn't actually the web.config that was the problem in my case, so I went back to the original project and added a chart to another web form as an experiment, and it worked! Even more surprising was that after that I went to the offending page and it worked too! Then I took the new chart off the other page and checked the original offending page and it was broken again. Then I found out if I put a chart control on any page before the offending page, it would work, otherwise it threw the exception. These controls are so cool though that I didn't have a problem finding another page to put one on in the path of the offending page :)

This fixed the problem but if anyone has any theory why I'd be interested...maybe a bug?