Telerik controls gives error on design page but works - asp.net

Gives me this error on Design View but it works in Code View and in Code-behind.
Wat may be the reason? I have an old .dll of Telerik
I'm using Visual Studio 2010. I havent used any installation of Telerik.
I copy "Telerik.Web.UI.dll" into Bin directory then add reference to my project
I have only 1 dll ("Telerik.Web.UI.dll" ) do I need other dll's as well to be able to work on Design View

I think that you must install Telerik controls to be able to use them in designer.

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