some problem while using biblatex

Question

I have some problem while using biblatex.I add package like this:

\usepackage[hyperref=true,backend=biber,style=alphabetic,backref=true,url=false]{biblatex}
\addbibresource{ref.bib}

and it's my bib file:

@book{Heath,
title="A history of Greek Mathematics,Vol 1",
author="Thomas Heath",
publisher="Oxford University Press",
year="1921"
}

then I cite it like this:

but not other tool\cite{Heath}

when I compile with xelatex and bibtex,texstudio say there is some problem:

I don't know how to fix it.Please help me. Thanks in advance!