I am failing to uncover Sweave chunks step by step using the LaTeX beamer
class.

The following minimal example:

\documentclass{beamer}
\usepackage{Sweave}
\begin{document}
\begin{frame}[fragile]
  In the year \uncover<2->{25}\uncover<3->{\Sexpr{5*5}}
\uncover<4->{
<<echo=TRUE, print=TRUE>>=
5*5*101
@   
}
\end{frame}
\end{document}

leads to an error message when running pdflatex over the *.tex file:

[...]
! FancyVerb Error:
  Extraneous input ` 2525 \end {Soutput} \end {Schunk} \bea...@endcovered ' bet
ween \begin{Soutput}[<key=value>] and line end
.
\...@error ... {FancyVerb Error:
\space \space #1
}
     
-- 
Johannes Hüsing               There is something fascinating about science. 
                              One gets such wholesale returns of conjecture 
mailto:johan...@huesing.name  from such a trifling investment of fact.          
      
http://derwisch.wikidot.com         (Mark Twain, "Life on the Mississippi")

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