# \addbibresource yields undefined control sequence with Beamer

I am making a handout with beamer, and I get the error message undefined control sequence when I add the \addbibresource command to the preamble. This seems to happen only when document class is beamer, not in articles. I have MikTex 2.9 and I use Winedt 10.

The MWE:

\documentclass[14pt, handout]{beamer}
\usepackage[english]{babel}
\usepackage{xyling}
\usepackage[normalem]{ulem}
\usepackage{pgfpages}
\pgfpagesuselayout{2 on 1}[a4paper, border shrink=5mm]
\begin{document}
\begin{frame}
Some text \cite{EKP2018}
\end{frame}
\end{document}
• \addbibresource is a biblatex command. You need to load biblatex yourself. beamer does not load it. – moewe Oct 15 '18 at 10:14