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I use WinEdt 5

Thanks for your helping. May you clearly explain ? The reason is epstopdf.sty ??? but when i cancel this package, the error still appear. How about --enable-write18 option? Thanks.

* I have script like this :
\documentclass[11pt]{article}
\usepackage{graphicx}
\usepackage{epstopdf}
\begin{document}
\includegraphics[width=0.8\textwidth]{logo.eps}
\end{document}

When i compile, it has error in log file:

This is pdfTeX, Version 3.1415926-1.40.9 (MiKTeX 2.7) (preloaded ...