There are two reasons why you may be getting this message.
The first is that you may have referenced our assemblies from different versions. Try to remove all Telerik assembly references and add them again, making sure to reference assemblies with the same version.
The second reason for this message is that you may have not added all the references to the project. You can read this article to see the required references in order to use RadPdfViewer.
Once you have removed and added the references, clean the solution or even manually delete the bin/obj folders, as sometimes Visual Studio tends to use the locally copied binaries.
I hope this helps!
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