We have investigated your problem and it turns out that some other software installation has installed an older version of Json.NET (Newthonsoft. Json.dll) library in the Global Assembly Cache and Graphite is loading this assembly instead of the correct one.
We are in a process of testing and verifying a new version of Icenium Graphite that will use the correct version of the library.
Note: As a temporary workaround you may remove this assembly from the GAC, but you should be aware that the other software that rely on it might break.
Hope this helps,
the Telerik team
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