(main.aux)
No file main.bbl.

LaTeX Warning: Citation 'einstein' on page 1 undefined on input line 22.

documentclass{article}
usepackage[hyperref=true,
    natbib=true,
    style=authortitle-dw,
    backend=biber]{biblatex}

begin{filecontents}{jobname.bib}
    @article{einstein,
        author = {Albert Einstein},
        title = {the true about tree},
        journaltitle = {Annalen der Physik},
        year = {1905},
        volume = {322},
        number = {10},
        pages = {891--921}
    }
end{filecontents}
addbibresource{jobname.bib}

begin{document}
    Hallo world \
    cite{einstein}
    printbibliography
end{document}