We are not aware of issues related to the .Net version. The chart should work in .Net 4.0 and .Net 4.5+ also. Can you double check the referenced assemblies? Note that RadChart doesn't support NoXaml
dlls and if the referenced dlls are NoXaml issues as the reported one could occur.
Also, note that RadChart is our old charting component. Instead I would recommend you to use RadChartView
instead. It is faster, easier to set up and more flexible. You can read more about this in the RadChart vs. RadChartView
Telerik by Progress
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