iText 7.7.1.16 - cannot open pdf document - itext7

I used itextsharp 5 for years, now I am testing iText 7 (v7.7.1.16.). I have a very strange issue with a simple code:
Dim src As String = My.Application.Info.DirectoryPath + "\test.pdf"
Dim reader As PdfReader = New PdfReader(src)
Dim pdfDoc As PdfDocument = New PdfDocument(reader)
the pdfdocument instance fails with error "Cannot open document" iText.Kernel.PdfException.
The file exists and the current user has access to read it (Copying the complete path during debug, I have got a working path: pdf opens in adobe acrobat). I tried to move file in another location, but the issue still occurs. I tried also with different pdf files.
Any ideas?
Thanks!
EDIT: I examined inner exception: unable to load assembly 'Common.Logging, Version=3.4.1.0, Culture=neutral, PublicKeyToken=af08829b84f0328e' but I added the reference to my project...

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