# signature fields beamer class

I want to add multiple (two) signature fields to the bottom of the first page of my beamer document. My first page is a \titlepage. I found a solution but it does not work for the beamer class because of an error

illegal parameter number in definition of \test, ... \iterate
and \beamer@doitinframe


My MWC is:

\documentclass[gray]{beamer}
\usetheme{default}

\title{Presentation}
\author{PersonName}
\date{27/3/2013}
\institute[InstitutionName]{}

\begin{document}
\begin{frame}
\titlepage
%% I was inserting the solution here
\end{frame}

\tableofcontents
\end{frame}

\section{First Section}
\begin{frame}{}
\end{frame}

\section{Second Section}
\begin{frame}{Two}
Content
\end{frame}

\section{Third Section}
\begin{frame}{Three}
Content
\end{frame}
\end{document}

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I'll adapt this solution to your case, to use only two names on signatures. Also, I deleted the date since you have it from \titlepage.

Insert the code below on preamble:

\newcommand{\doublesignature}[2]{%
\parbox{\textwidth}{
\vspace{1.5cm}

\parbox{.48\linewidth}{
\centering
\rule{\linewidth}{.7pt}\\
#1
}
\hfill
\parbox{.48\linewidth}{
\centering
\rule{\linewidth}{.7pt}\\
#2
}
}
}


and after \titlepage use

\doublesignature{First}{Second}


Here is the sample:

You can adjust the size of the boxes and rules if the names are too long.

Try to read and understand the code.

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