Bibliography not printed in #TexShop

Question

I am new to LaTeX. I am using TexShop 4.27. I am writing a book using article class scrbook. I am having problems with compiling the bibliography. I have searched this forum for possible answers, but was unsuccessful. Any suggestions are welcome. Here is the preamble:

\documentclass[11pt,english]{scrbook}

\renewcommand*{\chaptermarkformat}{}

\setkomafont{subsection}{\Large\bfseries}
\setkomafont{subsubsection}{\large\bfseries}

\addtokomafont{disposition}{\rmfamily}

\usepackage{fontspec}
\usepackage[paperwidth=16cm,paperheight=24cm]{geometry}
\geometry{verbose,tmargin=2.5cm,bmargin=2.5cm,lmargin=2cm,rmargin=2cm}
\usepackage{array}
\usepackage{verbatim}
\usepackage{longtable}
\usepackage{enumitem}

\usepackage{xunicode}
\usepackage{xltxtra}
\usepackage{polyglossia}
\setdefaultlanguage{english}
\setmainfont{Gentium Plus}


\usepackage[
backend=biber,
style=authoryear,
sorting=nyt,
bibstyle=philosophy-modern,
publocformat=loccolonpub,
inbeforejournal=true]{biblatex}

\addbibresource{mybiblio.bib}