LaTeX Forum

\documentclass{beamer}
\setbeamertemplate{navigation symbols}{}
\usetheme{Warsaw}

\usepackage{ngerman}
\usepackage[ngerman]{varioref}
\usepackage[latin1]{inputenc}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{graphicx}
\usepackage{subfigure}
\usepackage{cite}
\usepackage{hyperref}
\usepackage{units}
\usepackage{commath}
\usepackage{multicol}
\usepackage{array}
\usepackage{upgreek}

\setbeamertemplate{footline}[frame number]
\beamersetuncovermixins{\opaqueness<1>{25}}{\opaqueness<2->{15}}

\begin{document}

\begin{frame}
\frametitle{Inhaltsverzeichnis}
\tableofcontents
\end{frame}

\section{Was ist der Hall-Effekt?}
\begin{frame}\frametitle{Einleitung}
\begin{itemize}
 \item Hall-Effekt wurde 1879 von Edwin Hall entdeckt
 \item beschreibt die Bewegung von bewegten Ladungsträgern in externen magnetischen Feld
\end{itemize}
\end{frame}

\end{document}

LaTeX Font Warning: Font shape `OT1/cmss/m/n' in size <4> not available
(Font)              size <5> substituted on input line 55.

[1{C:/ProgramData/MiKTeX/2.7/pdftex/config/pdftex.map}] (Hall_Vortrag.toc
! Undefined control sequence.
\select@language ... \@empty }\languageshorthands 
                                                  {none}\babel@beginsave \cs...
l.2 \select@language {ngerman}
                              
? 
! Emergency stop.
\select@language ... \@empty }\languageshorthands 
                                                  {none}\babel@beginsave \cs...
l.2 \select@language {ngerman}
                              
!  ==> Fatal error occurred, no output PDF file produced!
Transcript written on Hall_Vortrag.log.

\usepackage[ngerman]{babel} 

\usepackage{ngerman} 

\usepackage[ngerman]{babel}