Problem inserting .pdf_tex file from Inkscape

Question

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.

Answer 1

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