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Updating the packages has solved the problem! Thank you so much for your help!

Kind regards,
Martin

Ok, I will try to update it.

Oh, the names of the database should be the same as before - I just replaced it wrongly. Its real name is "spieltheorie2.bib" and its saved in the same directory as the tex-file - that's why I cannot understand that it cannot find the file.

Anyway, I'll update biber ...

Thanks a lot for your answers!

I've now set biber as the standard bibliography programme in TeXstudio, but I do not get the usual error messages that are mentioned in the sources you gave me.

I got this error message instead:
INFO - This is Biber 2.3
INFO - Logfile is '<filename>.blg'
INFO ...

Hello!

I've signed up to this forum as Latex - however much I love it - is driving me to despair right now :|

What I would like to do is the create a bibliography in German and citing the sources in apastyle. So I've made a bibliography using biblatex, but on the one hand no bibliography in the ...