I 'm using to PdfiumViewer convert pdf to image

```
var document = PdfiumViewer.PdfDocument.Load(pdfoutputFilePath + TafCode + ".pdf");  
var image = document.Render(0, 842, 595, true);  
image.Save(imageoutputFilePath + TafCode + ".png", ImageFormat.Png);

```

When I do I remove pdf

An error opening the PDF!

How close pdf?