[Tex/LaTex] Citation label instead of number of reference

biblatexbibliographiesbibtex

I have a problem regarding the bibliography in my document. My code is the following:

\documentclass[runningheads,a4paper]{llncs}
\usepackage{amssymb}
\setcounter{tocdepth}{3}
\usepackage{graphicx}
\usepackage{url}
\usepackage{hyperref}
\usepackage[backend=bibtex]{biblatex}

\begin{document}

Hello world! \cite{wu2015deep}

\begin{thebibliography}{1}

\bibitem{wu2015deep} Wu J, Yu Y, Huang C., Yu K. Multiple Instance Learning for Image Classification and Auto-Annotation. In CVPR 2015, pp. 3460--3469
\end{thebibliography}

\end{document}

And the output of my code is the following:

enter image description here

As you can see instead of [1], the reference is [wu2015deep].
Do you have any idea what is the problem that's causing this? I am using TeXMaker 4.5, compiling with the option:
pdflatex + Bib(la)tex + pdflatex (x2) + View PDF

Thank you very much in advance for your time and help! 🙂

Best Answer

With the following code you will get the [1]:

\documentclass[runningheads,a4paper]{report}
\usepackage{amssymb}
\setcounter{tocdepth}{3}
\usepackage{graphicx}
\usepackage{url}
\usepackage{hyperref}
\usepackage{acronym}

\begin{document}

Hello world! \cite{wu2015deep}

\begin{thebibliography}{----}

\bibitem{wu2015deep}
%\textsc{Wu},  J. \textsc{Yu}, Y.  \textsc{Huang} C. \& \textsc{Yu} K. (2015) {\it Multiple Instance Learning for Image Classification and Auto-Annotation.} In CVPR 2015, pp. 3460--3469
Wu J, Yu Y, Huang C., Yu K. Multiple Instance Learning for Image Classification and Auto-Annotation. In CVPR 2015, pp. 3460--3469
\end{thebibliography}

\end{document}
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