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Dear Johannes,
done, one } to much, maybe a leftover from my last experiments ... now latex runs through and the logfile looks ok for my knowledge.

... and! I run biber and latex now several times over the script ... i have it now! problem solved.

Thank you for your patience and help!

Dear Johannes,
yes i have one citation for testing inside the documents ... if i run pdflatex on my main document, i get this protocol

This is pdfTeX, Version 3.14159265-2.6-1.40.19 (TeX Live 2018/W32TeX) (preloaded format=pdflatex)
restricted \write18 enabled.
entering extended mode
(./chefsache ...

Thank you ... i will work through this.

To clearify my question...
I have a maindocument --> root.tex
and some subdocuments --> chapter01.tex; chapter02.tex etc. resources.tex

in root.tex is written
\usepackage[babel,german=guillemets]{csquotes}
\usepackage{biblatex}
\addbibresource{latexlit.bib ...

Dear Forum...
I started writing my PHD in LATEX and so far so good ... managed to have a good start with texworks and the first pdflatex compilations run through very smoothly.

I made a main document and some sub documents. One of the sub documents contains the sources and \printbibliography. For ...