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The most common cause for such behavior is mixed-up references or a missing reference. All referenced .dll files should be the same version. Please try removing all references and adding them anew, cleaning and rebuilding the project. You could look at this article
about which Assembly References are needed.
If your desired scenario is to load an embedded file, please check whether the file is embedded as a Resource.
Also, you could find more information about Showing a file in RadPdfViewer here
In case this does not help please share further details on your setup. I would be glad to provide any assistance.
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