[pdftex] PDFLaTeX fflush error

[Adalberto A. Dornelles F.]

Hi,

I have a problem usin WinEdt and PDFLaTeX... Someone can helpme?
I want to make a book with

\documentclass[a4paper,12pt]{book}
\usepackage[pdftex]{graphicx}

I have separed files for chapters

\input{FunGraf/FunGraf.tex}
\input{FunLin/FunLin.tex}
\input{FunPol/FunPol.tex}
\input{FunRac/FunRac.tex}
\input{FunTri/FunTri.tex}
\input{ExpLog/ExpLog.tex}
\input{OpFun/OpFun.tex}
\input{Model/Model.tex}

and include some figures (40) in jpg format with

\begin{figure}[htbp]
  \centering
  \includegraphics[width=0.70\textwidth]{Model/RetaMQ.jpg}
  \caption{Um determinado conjunto de dados e a correspondente reta de 
regressão dos mínimos quadrados.}
  \label{fig:RetaMQ}
\end{figure}

If I include just four or five chapters, ok, everything is perfect. But 
if I include allchapters I get a error message:

Error: pdflatex: fflush() failed
 ==> Fatal error occurred, the output PDF file is not finished!

I guess there are some kind of memory error with or ...

Thanks in advance
Adalberto
Brasil