"Empty bibliography."

Question

I'm trying to write the bibliography of my bachelor's degree thesis using the biblatex package, but when I compile my .tex file a warning says "Empty bibliography." and nothing appear on the output pdf.

This is my main file:

\documentclass[12pt]{article}
\usepackage{amsmath}
\usepackage[backend=biber]{biblatex}
\addbibresource{Bibliography.bib}
\usepackage{comment}
\usepackage{amssymb}
\usepackage{graphicx}
\usepackage{float}
\begin{document}
\tableofcontents
\newpage
%bibliografia (aggiornata)
%das ferbel
%quantum field theory for gifted amateaur
%articolo higgs mechanism
%prima pagina madgraph
%documentazione madgraph
\section{Introduction}
\input{introduction.tex}
\section{Come faccio i calcoli all'LHC}
\section{Processi sensibili a $y_t$}
\section{Misura di 3+4 top semplificata}
\section{Unitarietà}
\newpage
\section*{Bibliography}
%\input{bibliography.tex}
%\bibliographystyle{plain}
%\addbibresource{Bibliography.bib}
\printbibliography
\end{document}

And this is my .bib file, as you can see it s not empty as the compiler says:

@article{wombat2016,
    author   = {Walther Wombat and Klaus Koala},
    title    = {The true meaning of 42},
    journal  = {Journal of modern skepticism},
    date     = {201},
    keywords = {trusted},
}
@book{lion2010,
    author       = {Laura Lion and Gabrielle Giraffe and Carl Capybara},
    title        = {The dangers of asking the wrong question},
    publisher    = {publishing house},
    date         = {2010},
    keywords     = {trusted},
}
@online{wikibook,
    title        = {Generating Bibliographies with biblatex and biber},
    organization = {Wikibooks},
    date         = {2016},
    urldate      = {2016-03-07},
    url          = {https://en.wikibooks.org/wiki/LaTeX/Generating_Bibliographies_with_biblatex_and_biber},
    keywords     = {untrusted},
}

Thanks in advance for your help! Edoardo