The type 'Telerik.Charting.ChartSeries' exists in both
    'c:WINDOWSMicrosoft.NETFrameworkv2.0.50727Temporary ASP.NET
     Filesinternetcms84aae664ef33a0e2assemblydl379307436
    00e4973e_e51cc901
    RadChart.Net2.DLL'

    and

    'c:WINDOWSMicrosoft.NETFrameworkv2.0.50727Temporary ASP.NET
 Filesinternetcms84aae664ef33a0e2assemblydl3f477bd61e6a2b770_714ec901
    Telerik.Charting.DLL'

<add path="ChartImage.axd" verb="*" type="Telerik.Web.UI.ChartHttpHandler,
 Telerik.Web.UI, Version=2008.2.826.20, Culture=neutral,
PublicKeyToken=121fae78165ba3d4" validate="false" />