[Tex/LaTex] Error on tabular; “Something’s wrong–perhaps a missing \item.” (No itemize or enumerate)

errorstables

I know about this question and this one but the problem I am having does not relate to section headings, and I am not using itemize or enumerate. So they don’t help me.
As in the question title, the error message (using pdflatex) is 

! LaTeX Error: Something's wrong--perhaps a missing \item.

It's a latex beamer doc;

\documentclass{beamer}

\usepackage{graphicx}
\usepackage{caption}
\usepackage{color}
\usepackage{amsmath}

\mode<presentation>
{    
  \usecolortheme{default} 
  \usefonttheme{default}  
  \setbeamertemplate{navigation symbols}{}
  \setbeamertemplate{caption}[numbered]
} 


\title[Such a title]{Title}
\author{Ron Weasley}
\institute{Hogwarts}
\date{19th of January 2017}

\begin{document}

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

\begin{frame}{Outline} %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \tableofcontents
\end{frame}

\section{Introduction} %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}{Finding solutions}
Problem \(\rightarrow\) Formalism \(\rightarrow\) Result
\end{frame}


\section{Merits of Formalisms}

\begin{frame}{Instant form} %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{figure}
        \includegraphics[width=0.6\textwidth]{LightConeImages/InstantLightCone}
    \end{figure}
\end{frame}

\begin{frame}{Poincar\'e group in instant form} %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{tabular}{c c c}
    \(P^1\) & \(P^3\) & \(M^{12}\)\\
    \begin{figure}
        \includegraphics[width=0.3\textwidth]{LightConeImages/BackLightCone}
    \end{figure}
    &
    \begin{figure}
        \includegraphics[width=0.3\textwidth]{LightConeImages/RightLightCone}
    \end{figure}
    &
    \begin{figure}
        \includegraphics[width=0.3\textwidth]{LightConeImages/TurnLightCone}
    \end{figure}
    \\
\end{tabular}
\end{frame}


\end{document}

Commenting out the tabular section does remove the error, so I'm sure it's that. How can I resolve this?

Best Answer

Solved the problem;

\begin{tabular}{c c c}
    \(P^1\) & \(P^3\) & \(M^{12}\)\\
        \includegraphics[width=0.3\textwidth]{LightConeImages/BackLightCone}
    &
        \includegraphics[width=0.3\textwidth]{LightConeImages/RightLightCone}
    &
        \includegraphics[width=0.3\textwidth]{LightConeImages/TurnLightCone}
    \\
\end{tabular}

Basically, figures are not allowed in a tabular environment. Just use \includegraphics on its own.

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