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unrecognized tag prefix or device filter 'telerik'

I have this on aspx page already still seeing this error..


<%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %>
I had version 2007, now recently downloaded 2011 version.. maybe that is causing the error.?should I unistall the old version ?
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1jaws
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1jaws
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1jawsAuthor Commented:
thanks for replying but I have seen this while googling but that is not my solution.  
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1jawsAuthor Commented:
All I had to do , drag and drop the control to aspx page, that error is gone, before I was copying and pasting.. that was causing it for some reason. Thank you for your attemp to help!
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