TiKZ & exceltex

Dear TiKZ experts,
I'm trying to get some data from an excel file and use them as a
parameter for the \draw command but I got this message:

   [Loading MPS to PDF converter (version 2006.09.02).]
   ) ABD: EveryShipout initializing macros
   ! Missing \endcsname inserted.
   <to be read again>
                      \csname\endcsname
   l.13     }

   ?

and no pdf is generated and in worst case I also get an infinite loop.

The following is a short example of the problem:

   \documentclass[10pt,svgnames]{article}
   \usepackage{color} % used by exceltex
   \usepackage{exceltex}

   \usepackage{tikz}
   \usepackage{pgffor}

   \begin{document}

   \begin{tikzpicture}[]
      \foreach \x/\y/\step in {0.5/0.5/1, 10/0.5/2, 19.5/0.5/3}{
         \draw[{\inccell{dati.xls!ECOOP09!C1}}, line width=.2cm, rounded corners=7pt] (\x cm+.25cm,\y cm+.25cm) rectangle +(8.5,5.5) ;
      }
   \end{tikzpicture}

   \end{document}

in this case the content of the excel is a color name such as Gold Teal
and so on.

Any idea? Any help is really appreciated.

Thank you in Advance for the help

Cheers
Walter

--
Walter Cazzola, PhD - Assistant Professor, DICo, University of Milano
E-mail cazzola@... Ph.: +39 02 503 16300  Fax: +39 02 503 16253
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