Thanks for contacting us.
This is a known issue with Sitefinity 3.1 and it is related to the changes in the RadChart control API. The workaround is to create a folder named Temp
in the root directory of your application. You could control this folder through the TempImagesFolder property of the Chart control, which sets folder for the chart's temp images. Please grant the folder permissions for the ASPNET user account.
I hope that this resolves your technical issue. Feel free to contact us if you need further assistance.
the Telerik team
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