Error exporting to pdf

[Sergey]

I’m trying to save Silverlight controls to pdf, but the code crushes at the line, that saves the actual file with an error:

“Could not load file or assembly 'Telerik.Windows.Zip, Version=2012.2.725.1050, Culture=neutral, PublicKeyToken=5803cfa389c90ce7' or one of its dependencies. The system cannot find the file specified.”

I downloaded a sample from telerik forum, and it works fine with the same code.
I use VS2010 and Silverlight 5. I checked all assemblies and they are all of the same version

private void export(object sender, RoutedEventArgs e)

{

    SaveFileDialog sfd = new SaveFileDialog();

    Section section = new Section();

    Paragraph paragraph = new Paragraph();

    BitmapImage img = new BitmapImage();

    sfd.DefaultExt = "pdf";

    sfd.Filter = "PDF File (*.pdf) | *.pdf";

    if (sfd.ShowDialog() == true)

    {

        RadDocument document = new RadDocument();

        using (MemoryStream stream = new MemoryStream())

        {

            ExportExtensions.ExportToImage((FrameworkElement)LayoutRoot, stream, new PngBitmapEncoder());

            img.SetSource(stream);

        }

        ImageInline image = new ImageInline(new WriteableBitmap(img));

        paragraph.Inlines.Add(image);

        section.Blocks.Add(paragraph);

        document.Sections.Add(section);

        PdfFormatProvider pdf = new PdfFormatProvider();

        using (Stream os = sfd.OpenFile())

        {                  

            pdf.Export(document, os); //this line throws the exception


        }

    }

}