I'm so sorry for the probably stupid question, but somehow I'm stucked. It's my first try to make a presentation in LaTeX. So I will approve every one of your advices (probably a site or something to start with).

Of course I'll delete my insignificant question afterwards, so no worries about that one.

Thank you for your understanding!


    \title{3D- Lithography}
    \subtitle{Microfabrication through Two-Photon Photopolymerization}

    \institute[]{\normlsize Material Science Seminar\\
    University of Stuttgart\\[\baselineskip]
    \author{Biri Dimi}



    \frametitle{Table of Contents}

    \frametitle{Table of Contents}
  • Typo: \normalsize, nicht \normlsize! – Joseph Wright Jun 24 '13 at 19:10
  • You have \institute[]{\normlsize Material...}. It should be \institute[]{\normalsize Material...} (there's an "a" missing in \normalsize). – Gonzalo Medina Jun 24 '13 at 19:10
  • @JosephWright how to recognize such typo mistake, when the notifier sends me like several lines under it? – Biri Jun 24 '13 at 19:16
  • @Biri your code produces the massage ! Undefined control sequence. \insertinstitute ... {\beamer@andinst }\normlsize Material Science Seminar\\... l.19 \end{frame} and the last word of the line immediately after "! Undefined control sequence." is where the problem is. Unfortunately a comment doesn't allow proper code formatting, but the last word in the relevant line is \normlsize, so that's where the problem lies. – Gonzalo Medina Jun 24 '13 at 19:19
  • @GonzaloMedina well, perhaps it wasn't that difficult than I thought. But as I said I'm new to that and really don't know from where to start. Till now I managed to write some reports, but I really feel ashame so perhaps you could give some advices. – Biri Jun 24 '13 at 19:31

If you typeset the example, you get

! Undefined control sequence.
\insertinstitute ... {\beamer@andinst }\normlsize 
                                                  Material Science Seminar\\...
l.19     \end{frame}


Crucially to understand the problem, TeX splits the problematic line at the undefined control sequence, here \normlsize (should be \normalsize). It's this 'split' in a line that tells you where the problem is: the error actually gets trapped not at the point of input but at the point where beamer tries to use the information, which is why we see internal stuff such as \beamer@andinst.

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