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I was working on my thesis and everything is fine and works as ist should.

enter image description here

Then I realized that this is written in the log file: enter image description here

The document still works fine but I do not understand what it wants to tell me or what the actual problem is since I do not remember changing anything. Do I have to worry about that. What did I wrong?

I am using this biblatex package:

\usepackage[backend=bibtex,style=authoryear,natbib=true, maxbibnames=99, maxcitenames=1]{biblatex}
\addbibresource{bibliogrpahy.bib}

Can anyone help me understanding the problem?

MS-SPO
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Roland
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    The biblatex warning about the BIbTeX backend will always (well at least for a few years) have been there. And it means pretty much what it says: You are using BibTeX and not Biber, but with BibTeX not all features of biblatex are available. It is recommended you switch to backend=biber, and run Biber instead of BibTeX (https://tex.stackexchange.com/q/154751/35864). – moewe Aug 06 '21 at 05:31
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    The other messages are unrelated: Most come from multiply defined labels, which suggest you used the same label fig:Label1 for different figures. Of course that does not go down well with LaTeX since it cannot know which of the several figures you mean when you now say \ref{fig:Label1}. Use each label only once and consider using more semantic names like fig:cat and fig:mouse instead of numeric labels like Label1. – moewe Aug 06 '21 at 05:32
  • @moewe I also read about backend=biber I just wonder why it comes now and never before. Also the second problem never apperead before and I did not add a new label. I went all all them trough so far I did not find any identical labels. But thanks I will try. – Roland Aug 06 '21 at 05:40
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    Well, I can assure you this biblatex warning has been implemented in biblatex for a long time. If you did not update recently and did not change your biblatex settings recently, the warning will have always been there. But it is possible that your editor hid the message from you until now. See https://tex.stackexchange.com/q/25701/35864 for some background on the terminology (and also https://tex.stackexchange.com/q/63852/35864). – moewe Aug 06 '21 at 05:42
  • It is possible that labels get messed up somehow, so you may want to try deleting your .aux, .bbl, .bcf, .toc, .lof, .lot files and recompiling from scratch (do not delete any files ending in .tex, .bib or graphic files). – moewe Aug 06 '21 at 05:43
  • @moewe mmh now all citations are gone and it says I found no \citation \bibdata \bibstyle commands – Roland Aug 06 '21 at 06:03
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    Did you change from backend=bibtex, to backend=biber,? In that case you need to run Biber and not BibTeX (see my comments and links above). If you stuck with backend=bibtex, keep in mind that you first need to run LaTeX (and the run should finish without errors) before you can run BibTeX. The LaTeX run needs to write the necessary auxiliary files for BibTeX. – moewe Aug 06 '21 at 06:05
  • @moewe Thanks a lot I forget to change it to biberin TexStudio. There are still bad boxes remaining, but I think they are unrelated to the original problem. – Roland Aug 06 '21 at 06:15

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