Hi thank you for the suggestions, I'm only guessing its a security problem from the message but I'm likely wrong.
I do have the chartimage.axd defined in the web.config, I used the smarttag to add it -
add path="ChartImage.axd" verb="*" type="Telerik.Web.UI.ChartHttpHandler, Telerik.Web.UI, Version=2007.3.1314.35, Culture=neutral, PublicKeyToken=121fae78165ba3d4" validate="false"/>
i opened "http://localhost:80/Instructor/ChartImage.axd" in my browser and in fact it does return the error 404 (file not found) - which is the error I showed from my first post.
Is there a file missing, I dont seem to see one in the install instructions or package, is the chartimage.axd created automatically?