citation problem biber/xelatex

I’m using MikteX with TexStudio (3.1.1). I Cannot get my references with Biber. Here’s what I have in preamble

    documentclass[12pt,a4paper]{article}

    usepackage{fontspec}

    usepackage{xltxtra}

    usepackage{xunicode}

    usepackage{polyglossia}

    setdefaultlanguage{french}

    bibliography{testa}

    usepackage[maxlevel=3]{csquotes}

    usepackage[backend=biber,citestyle=verbose-trad2,bibstyle=verbose-trad2]{biblatex}

The message I get from Biber is

INFO – This is Biber 2.16
INFO – Logfile is ‘calme.blg’
INFO – Reading ‘calme.bcf’
WARN – No data sources defined!
Processus terminé normalement

I have a new computer and my problem is that I have no problem with the documents made on my former computer, but only with the new documents, even with the same bib file. I read Biblatex with Biber: Configuring… but I had already typeset my editor to work with biber.

Any idea about where my problem comes from ?

bibliography{testa}
usepackage[maxlevel=3]{csquotes}
usepackage[backend=biber,citestyle=verbose-trad2,bibstyle=verbose-trad2]{biblatex}

usepackage[maxlevel=3]{csquotes}
usepackage[backend=biber, style=verbose-trad2]{biblatex}
addbibresource{testa.bib}