This code do not compile, this is figure environments inside tabular environmet, adding captions and labels

This code do not compile, this is figure environments inside tabular environmet, adding captions and labels.

I havent found the reason and an effective way to organize my graphs. This is the code Im using.

\documentclass[aspectratio=169,draft]{beamer}



\usepackage{beamerthemeshadow}
\usepackage[utf8]{inputenc}
\usepackage[spanish]{babel}
\usepackage{amsmath,amssymb}


\usepackage{amsfonts}

\usepackage{pgf,tikz}
\usetikzlibrary{arrows}
\usepackage{float}


\begin{document}

\frame{\frametitle{Implementación del Metodo de diferencias en redes cristlinas}

\begin{table}
\begin{tabular}{cc}
 \begin{figure}
\centering
\includegraphics[scale=.4]{RepRedSC2D}
\caption{Replicación de celdas Unitarias}
\label{redes}
\end{figure}        
s&  s  \\
\begin{figure}
\centering
\includegraphics[scale=.156]{11UnitSC2D}
\caption{Celda Unitaria SC -2D}
\label{Unit2D}
\end{figure}   \\
    s   &   d   \\
\end{tabular}
\end{table}

}

\end{document}