PDF24 editor cannot open files

PDF24 editor cannot open PDFs after scanning

Hi,
i have recently installed a new printer: HP Deskjet 3050A J611 series (wireless).
When i scan a file and i save it to PDF file, later my PDF24 editor cannot open or edit those files...

I receive the following error notice:

An error occurred while creating a document.
Reason: Error while reading PDF Info:
Invalid PDF format: loadObject, objNr mismatch

What do i have to do now?

THANKS!!