# Problem inserting .pdf_tex file from Inkscape

I am trying to insert an image from Inkscape. I saved it as a pdf, checking the PDF + Latex option.
Inside my Latex file, I wrote the following code :

\begin{figure}
\centering
\def\svgwidth{\columnwidth}
\input{topo4serv.pdf_tex}
\end{figure}


but when i try to compile using pdflatex, it gives me the following error message:

ERROR: Undefined control sequence.

--- TeX said ---
<argument> \includegraphics
[width=\unitlength ]{topo4serv.pdf}
l.52 ...raphics[width=\unitlength]{topo4serv.pdf}}
%


In the output pdf file the text of the svg file is there but not the shapes...
If someone has an answer i would be very grateful.

-
Welcome to TeX.SX! Did you say \usepackage{graphicx} in your document? –  egreg Jun 29 '12 at 13:45
First time I am seeing something like topo4serv.pdf_tex. I would rather say \includegraphics{topo4serv.pdf} –  azetina Jun 29 '12 at 14:21
@azetina Usage seems correct as it is stated here: tug.ctan.org/tex-archive/info/svg-inkscape –  interlude Jun 29 '12 at 15:14
It is correct to use \input{file.pdf_tex}. If you open that file, it has instructions for its usage. Like egreg said, you need to have \usepackage{graphicx} in your preamble for this to work. –  Scribblemacher Jun 29 '12 at 17:45

\includegraphicsis giving error because it is not defined, which means you need to \usepackage{graphicx} on document's preamble