On Sep 12, 2012, at 10:55 AM, Rainer M Krug wrote:

>>> I have not used it recently, but I get the same error you do. I copied it 
>>> from Herbert Voss'
>>> tips and tricks page many years ago. It worked then, but I am not sure what 
>>> has changed.
>> 
>>> Actually…it looks like the /singlespacing command is causing the problem. 
>>> Delete that and the
>>> centering still works.
> 
> Great - thanks

\singlespacing requires the setspace package
not really sure what it was intended to do in this context.

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