Warning message with biblatex references

[Rnewuser]

I'm trying to figure out why my biblatex references are not showed up when I knit my file. I get the following warning :

Avis : Package biblatex Warning: Please (re)run Biber on the file:

Avis : (biblatex) Untitled

Avis : (biblatex) and rerun LaTeX afterwards.

How could I fix that? This is my MWE:

---
title: "A title"
output:
  pdf_document:
    latex_engine: xelatex
    citation_package: biblatex
    toc: yes
    toc_depth: 4
    number_sections: yes
  html_document:
    toc: yes
    toc_depth: '4'
    df_print: paged
  word_document: 
    toc: yes
    toc_depth: 4
date: ""
bibliography: Lectures.bib
biblio-title: Références, heading=bibintoc
links-as-notes: yes
link-citations: yes
header-includes:
- \usepackage{fontspec}
- \setmainfont{Times New Roman}
- \usepackage{fancyhdr}
- \pagestyle{headings}
- \fancyfoot[LE,RO]{\thepage}
- \usepackage[french]{babel}
- \usepackage[backend=biber,style=apa]{biblatex}
- \DeclareLanguageMapping{french}{french-apa}
- \DefineBibliographyExtras{french}{\restorecommand\mkbibnamefamily}
- \setlength\parskip{0.5ex}
- \setlength{\parindent}{2.5ex}
---
# Introduction
# References

[cderv]

@Rnewuser

This is my MWE:

We are missing content for the reference and also Lectures.bib to be able to run this.

Can you share a real reprocubile examples ?

[Rnewuser]

Thank you for your answer. I was verifying that everything is really OK now. In fact, it seems that I had to reload my bib.file in order to output a references section. It works now.

[cderv]

Glad it works!

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