[tex-live] Illegal parameter number in definition of \@preamblecmds

Robin Fairbairns Robin.Fairbairns at cl.cam.ac.uk
Sun Oct 4 11:22:20 CEST 2009

Eric Faden <efaden at brynmawr.edu> wrote:

> I just updated to Tex Live 2009 - Using Mac Pretest.... since then I
> am now getting the following error....
> "Illegal parameter number in definition of \@preamblecmds"
> I think it has something to do with mhchem, rotfloat, float, and/or
> floatrow... not sure where to go from here?  Any ideas what this could
> be?

one of those, or one of the other packages, or the like.

without more detail, no-one will be able to debug anything for you.
(you don't even tell us what dates you have on those packages...)

you could try


or you could go for


and get someone else to do the work for you.


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