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Thanks a lot. That was indeed the issue. Everything works fine now!

thanks for the comment!
I tried your example, but that does not work either. I am getting the result below. Is the source of the problem maybe that I have not properly installed the required files for apa? (so far, I have stored apa.bst, apa.cls, apa.sty, apacite.dtx under C:\Program Files\texmf ...

Hi!
I tried to convert my file from the article class into the apa.cls class. When I run latex, I get the result "0 errors, 0 warnings, 0 overfull boxes, 0 pages". I had the problem in the article class before, and it was due to the wrong positioning of the \begin{document} and \maketitle commands ...