General ⇒ Error in Bibliography of Presentation

[pallav]

In the following code, there is one error though the PDF has no error. The log file indicating one error.

Code: Select all

\documentclass[
  smaller,
  professionalfonts,
  hyperref={
    colorlinks=true,
    breaklinks=true,
    bookmarks=true,
    linkcolor=blue,
    anchorcolor=blue,
    citecolor=blue,
    filecolor=red,
    urlcolor=red,
    pdfpagemode=FullScreen
  }
]{beamer}
\usepackage{beamerthemesplit}
\mode<presentation>{
  \usetheme{shadow}
  \def\colorize<#1>{\temporal<#1>{\color{red}}{\color{red}}{\color{black!50}}}
  \beamersetaveragebackground{yellow!10}
  \beamertemplateshadingbackground{blue!5}{yellow!10}
  \setbeamertemplate{frametitle}[from second]{}
  \setbeamercovered{dynamic}
}
\usepackage{graphicx}
\usepackage[authoryear, numbers, semicolon, sort&compress]{natbib}
\usepackage{ragged2e}
\usepackage{lmodern}


\title{Title of the Presentation}
\author[abc]{Author Name}
\institute{Institution}
\date{}

\justifying
\begin{document}

\begin{frame}
  \titlepage
\end{frame}

\section{Introduction}

\subsection{What is Allee effect}

\begin{frame}
  \begin{beamerboxesrounded}[shadow=true]{What is ...............}
    \begin{itemize}\justifying
      \item<alert@1> \textbf<1>{The \cite{aziz2003boundedness}}
    \end{itemize}
    \begin{itemize}\justifying
      \pause
      \item<alert@2> \textbf<2>{This \cite{aziz2003boundedness}}
    \end{itemize}
  \end{beamerboxesrounded}
\end{frame}

\begin{frame}
  \label{Bibliography}
  \begin{center}
   \Huge {References}
  \end{center}

  \bibliographystyle{spbasic}
  \bibliography{bibl}
\end{frame}
\end{document}

A new test.bbl file is opening which contains the following.

Code: Select all

\begin{thebibliography}{1}
\providecommand{\natexlab}[1]{#1}
\providecommand{\url}[1]{{#1}}
\providecommand{\urlprefix}{URL }
\expandafter\ifx\csname urlstyle\endcsname\relax
  \providecommand{\doi}[1]{DOI~\discretionary{}{}{}#1}\else
  \providecommand{\doi}{DOI~\discretionary{}{}{}\begingroup
  \urlstyle{rm}\Url}\fi
\providecommand{\eprint}[2][]{\url{#2}}

\bibitem[{Aziz-Alaoui and Daher~Okiye(2003)}]{aziz2003boundedness}
Aziz-Alaoui M, Daher~Okiye M (2003) {Boundedness and global stability for a
  predator-prey model with modified Leslie-Gower and Holling-type II schemes}.
  Applied Mathematics Letters 16(7):1069--1075
\end{thebibliography}