\makeatletter
\def\vocalc#1{\gdef\@vocalc{#1}}
 \def\@vocalc{\@latex@warning@no@line{No me has dado al \noexpand\vocalb}}
\renewcommand\makeacta{%
             \begin{titlepage}%
             \def\@thanks{}%evita la ocurrencia de doble pie de pagina
  \let \footnotesize \small
  \let \footnoterule \relax
  \let \footnote \thanks %\relax
  %\let \mpfootnotetext{}
  \null\vfill
  %\vskip 60\p@
    \begin{flushleft}%
        {\Large \textbf{T\'{\i}tulo:} \@title \par}
             %\let\@thanks\relax
        {\Large \textbf{Estudiante:}\textsc{\@author} \par}%

    \end{flushleft}%

    \vspace{1cm}
    {\large
      \begin{center}%

        COMIT\'E
        \vspace{2cm}

        \begin{minipage}{5cm}
          \centering
          \vspace{1.2cm}%
          \rule{5cm}{1pt}%

          \@presidente

          Presidente
        \end{minipage}%
        \hspace{1cm}
        \begin{minipage}{5cm}
          \centering
          \vspace{1.2cm}%
          \rule{5cm}{1pt}%

          \@secretario

          Secretario
        \end{minipage}\\*[1cm]

        \begin{minipage}{5cm}
          \centering
          \vspace{1.2cm}%
          \rule{5cm}{1pt}%

          \@vocala

          Vocal
        \end{minipage}%
        \hspace{1cm}
        \begin{minipage}{5cm}
          \centering
          \vspace{1.2cm}%
          \rule{5cm}{1pt}%
        
          \@vocalb
        
          Vocal
        \end{minipage}\\*[1cm]
        
        \begin{minipage}{5cm}
          \centering
          \vspace{1.2cm}%
          \rule{5cm}{1pt}%

          \@vocalc

          Vocal
        \end{minipage}%
        \hspace{1cm}
        \begin{minipage}{5cm}
          \centering
          \vspace{1.2cm}%
          \rule{5cm}{1pt}%

          \@asesor

          Asesor
        \end{minipage}
      \end{center}}
             \@thanks\par
      \vfill\null
  % \@thanks\par          
%
 %  {\@thanks\par}%    
  \end{titlepage}%
      \setcounter{footnote}{0}%
%  \global\let\thanks\relax
%  \global\let\makeacta\relax
%  \global\let\@thanks\@empty
%  \global\let\@author\@empty
%  \global\let\@date\@empty
%  \global\let\@title\@empty
%  \global\let\title\relax
%  \global\let\author\relax
%  \global\let\date\relax
%  \global\let\and\relax
%  \gloabal\let\thanks\relax
%  \global\let\footnote\relax
}
\makeatother
