# can't open simple pdf created with latex with gscan2pdf

So, I want to make one pdf from multiple. For this, I decided to use gscan2pdf. I have a bunch of "image-pdfs" that open just fine.

I have to insert a page with just a few lines of text on it. I created a simple pdf in latex:

\documentclass{article}
\title{Titel}
\begin{document}
\maketitle
test
\end{document}


That's it. It compiles perfectly fine. I can open it with my normal pdf reader. But, when I try to open it with gscan2pdf I get the following error every time:

Warning: gscan2pdf expects one image per page, but this was not satisfied. It is probable that the PDF has not been correcly imported.

If you wish to add scans to an existing PDF, use the prepend/append to PDF options in the Save dialogue.

What happens and how do I open the pdf?