difficulties with \presentationstep

["Michael A. Guravage" <guravage@nlr.nl>]

At the end of his article on "TeX as presentation tool" in MAPS 23, Hans 
describes how to use the \presentationstep macro. I wrote a toy example to try 
it, but the resulting document does not exhibit the expected behaviour, i.e. 
nothing is covered. Interestingly, the last line of output from texexec  was 
`b/e error in : step'; step.tex being the name of my input file.

Finally, Acrobat4 displays the following message when the document is opened:

	There was an error opening this document.
	There was a problem reading this document (14).

I would be grateful to hear if anyone else has experienced this, and even more grateful if someone would suggest how I might correct it.

Cheers,

Michael

P.S. For completeness sake, here is the text of my toy example:

% interface=en
\usemodule[pre-01]
\usemodule[pre-general]
\autopresentationsteptrue
\TitlePage {Slowly We Turn}
  \Topic {presentationstep}
  \startitemize
    \item moe
    \item larry
    \item curly-joe
  \stopitemize
\presentationstep
\startformula
  x+5y+10z+25u+50v=100
\stopformula
\presentationstep
\stoptext

-- 
Michael A. Guravage            Email: guravage@nlr.nl
National Aerospace Laboratory  Phone: +31 (0)20 511 3695
P.O. Box 90502, 1006 BM,       Fax:   +31 (0)20 511 3210
Amsterdam, The Netherlands     URL:   <http://www.nlr.nl>