sorry for the inconvenience. We have added MooTools perhaps two years ago as a convenience for developers, through ResourcesLinks control. Sitefinity itself is not using MooTools and in all honesty this is the first time we've heard of someone using it.
We'll make sure we update those in the future. However, a quick fix is that you include your own MooTools library, not using ResourceLinks enumeration.
Hope this helps.
All the best,
the Telerik team
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