> ## Documentation Index
> Fetch the complete documentation index at: https://resources.latex-cloud-studio.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Fix Bibliography Build Errors in LaTeX

> Troubleshoot BibTeX and BibLaTeX build problems, undefined citations, backend mismatches, and empty bibliographies.

Bibliography failures often come from backend mismatches and build order issues.

## Typical Errors

* `undefined citations`
* `empty bibliography`
* `Please (re)run Biber`
* `I couldn't open database file references.bib`

## Fix Workflow

1. Confirm system: BibTeX or BibLaTeX.
2. Match backend (`bibtex` vs `biber`).
3. Verify `.bib` filename and path.
4. Rebuild in correct sequence.

## Build Sequences

* BibTeX: LaTeX -> BibTeX -> LaTeX -> LaTeX
* BibLaTeX: LaTeX -> Biber -> LaTeX -> LaTeX

## Related Pages

* [BibLaTeX guide](/learn/latex/bibliography/biblatex-guide)
* [Natbib guide](/learn/latex/bibliography/natbib-guide)
* [Bibliography hub](/learn/latex/bibliography)