rarefaction curves: unable to run the R script from Gimlet

Hi everybody,
i'm trying to draw rarefaction curves to estimate a population size from
genotyped faeces.
I used the Gimlet software which gave me a script and a "rarefaction.txt"
file. I've copied both files in the work directory of R.
I changed library(nls) by library(stats) in the script.
But now, i'm still unable to run it.
If i ask to show error messages, the software gives me after the last line :
"Read 36 items
Erreur dans return(echa, faesel) :
 les renvois multi-arguments sont inderdits".

Does anybody know where i made a mistake?
It is a very old R script: package nls went in Oct 2004.  As did the 
(even longer deprecated) ability to do

return(mean, var)

which nowadays needs to be

return(list(mean=mean, var=var))

A guess at what software you are talking about suggests it was last 
updated in 2004.  There are enough people here who remember R from 
those days to be able to help with such R changes, but English 
messages (run R with LANGUAGE=en) will maximize the pool.
Thanks a lot,

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Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
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rarefaction curves: unable to run the R script from Gimlet

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