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This is my preamble

\usepackage{mathptmx} \usepackage{amsmath} \usepackage{amsfonts}
\usepackage{amssymb} \usepackage{graphicx}
\usepackage{tabularx} \usepackage{caption}

This is how the image is inserted in the document

\caption{Protocole expérimental pour l'essai décrit par pour l'étude
de la carcinogénicité du foie à moyen-terme \citep{Ito:1995vn}} 
\label{fig:ito1} \end{figure}

This error appears every time I try to compile in Latex

! LaTeX Error: Cannot determine size of graphic in figures/liver-foci-bioassay- 01.png (no BoundingBox). See the LaTeX manual or LaTeX Companion for explanation. Type H for immediate help.

How can I solve this problem?

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closed as too localized by lockstep, Stefan Kottwitz Apr 10 '13 at 10:41

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Are you compiling with latex.exe? If so, please switch to pdflatex.exe as you are importing PNG file. –  Please don't touch Feb 10 '13 at 18:16
Well, I am using TexMaker and I usually compile with a "quick compilation" option. However when I add citations I have to compile in latex and I get this error. Though, it doesn't seem to change anything in the document. –  esmitex Feb 10 '13 at 18:22
Make sure the quick compilation uses pdflatex.exe. –  Please don't touch Feb 10 '13 at 18:24
I have just tried with pdflatex I don't see the error. I thought it was something really important but apparently it's not. Thank you for the advice. –  esmitex Feb 10 '13 at 18:31
The "No bounding box" usually means LaTeX can't get the figure (not there, format unsupported). –  vonbrand Feb 10 '13 at 19:49