Error image.aspx

Hello,

I have this error that keeps occuring.

Do you have any idea what could be the cause of it?

Application_Error - Offending URL: http://mywebsite/RadControls/Chart/Image.aspx - Source: System.Web - Message: Value cannot be null.
Parameter name: key - Stack trace:    at System.Web.Caching.CacheInternal.DoGet(Boolean isPublic, String key, CacheGetOptions getOptions)
   at System.Web.Caching.Cache.get_Item(String key)
   at Telerik.WebControls.Dialogs.ChartImage.Page_Load(Object sender, EventArgs e)
   at System.Web.UI.Control.OnLoad(EventArgs e)
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Hi maternag,

RadChart stores its image in the cache for 5 minutes. If the image is requested during these 5 minutes, the timing is restarted, i.e. the image will be stored in the cache for another 5 minutes. It seems that the image has been requested after these 5 minutes have been elapsed. However, if the page with the chart has been requested, a new image should have been generated, so this error should not appear.

How often does this error occur? Can you provide more details about your scenario? Do you have a page with RadChart and another page which points to the chart in the first one by any chance?

Best wishes,
Ves
the Telerik team