General ⇒ latex warning--i didn't find a database entry for

[joey24]

Hi everyone,

i have a big problem and it makes me crazy

I have my .tex data in the folder "TEST" and reference.bib in the some folder.

I have 4 different references for the Bibliography.

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@incollection{heisenberg1985quantentheoretische,
	title={{\"U}ber quantentheoretische Umdeutung kinematischer und mechanischer Beziehungen},
	author={Heisenberg, Werner},
	booktitle={Original Scientific Papers Wissenschaftliche Originalarbeiten},
	pages={382--396},
	year={1985},
	publisher={Springer}
} 

@article{everett1957relative, 
	title={" Relative state" formulation of quantum mechanics},
	author={Everett III, Hugh},
	journal={Reviews of modern physics},
	volume={29},
	number={3},
	pages={454},
	year={1957},
	publisher={APS}
}


@BOOK{Mainzer2021,
	AUTHOR = {Mainzer, Klaus},
	YEAR = {2021},
	TITLE = {Quantencomputer - Von der Quantenwelt zur Künstlichen Intelligenz},
	EDITION = {},
	ISBN = {978-3-662-61997-1},
	PUBLISHER = {Springer Berlin Heidelberg},
	ADDRESS = {Wiesbaden},
}

@mastersthesis{NeuralNetworks,
	author = {XY},
	title = {Anwendung Neuronaler Netze bei der Bewertung von amerikanischen Optionen},
	school = {University XY},
	year = {2017}}

So the first two references working fine, I get the bibtex from google scholar.
The third one is a book where I generated the bibtex information via a web page.
The last one is my own Masterthesis.
So the last two (Book, Thesis) doesn't work. I get for both [?] that output on the pdf and on the log panel I get the information "latex warning--i didn't find a database entry for". I don't know why. I tried some examples from the internet where it works but on my program it never works except I get the bibtex from google scholar.


Maybe someone can help me.
Thanks

[rais]

The information itself sounds misleading to me...
From LaTeX-side, it would look like

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LaTeX Warning: Citation `Mainzer2022' on page x undefined on input line y.

This warning rather looks like it's generated by BibTeX:

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Warning--I didn't find a database entry for "Mainzer2022"

Now, this can happen because of a typo in the cite key like here (the entry in the bib file is "Mainzer2021", after all), a faulty entry in the bib file causes BibTeX not to process everything, or BibTeX uses a different bib file than the one you modified.
Have a look at your .blg file (in case you're using Windows you may need to convince your file explorer not to hide known file extensions, first) and/or post it here.

KR
Rainer