I am quite new to latex. I am trying to insert few figures into my tex file but had no success.
Here is the file
\documentclass[12pt]{article}
\usepackage[pdftex]{graphicx}
\DeclareGraphicsExtensions{.pdf,.png,.gif,.jpg}
\begin{document}
\begin{figure}
\includegraphics{theory.png}
\end{figure}
\end{document}
when I latex this file, I get the following error message
This is pdfeTeX, Version 3.141592-1.21a-2.2 (Web2C 7.5.4)
entering extended mode
(./test.tex
LaTeX2e <2003/12/01>
Babel <v3.8d> and hyphenation patterns for american, french, german, ngerman, b
ahasa, basque, bulgarian, catalan, croatian, czech, danish, dutch, esperanto, e
stonian, finnish, greek, icelandic, irish, italian, latin, magyar, norsk, polis
h, portuges, romanian, russian, serbian, slovak, slovene, spanish, swedish, tur
kish, ukrainian, nohyphenation, loaded.
(/usr/share/texmf/tex/latex/base/article.cls
Document Class: article 2004/02/16 v1.4f Standard LaTeX document class
(/usr/share/texmf/tex/latex/base/size12.clo))
(/usr/share/texmf/tex/latex/graphics/graphicx.sty
(/usr/share/texmf/tex/latex/graphics/keyval.sty)
(/usr/share/texmf/tex/latex/graphics/graphics.sty
(/usr/share/texmf/tex/latex/graphics/trig.sty)
(/usr/share/texmf/tex/latex/graphics/graphics.cfg)
(/usr/share/texmf/tex/latex/graphics/pdftex.def))) (./test.aux)
(/usr/share/texmf/tex/context/base/supp-pdf.tex
(/usr/share/texmf/tex/context/base/supp-mis.tex
loading : Context Support Macros / Miscellaneous (2004.10.26)
)
loading : Context Support Macros / PDF (2004.03.26)
)libpng error: Not a PNG file
Error: latex (file theory.png): libpng: internal error
==> Fatal error occurred, the output PDF file is not finished!
Thanks in advance
