## Compile PDF gives "fatal error" with pdf pciture

I am not able to "compile pdf" when I include a .pdf picture. I can preview pdf though. I am attaching the test file with a figure. (I will upgrade from 5.5. to 6 if I can compile my lecture notes. When I tried last time, it did not work, kept crushing).
Error message:
LaTeX Warning: Reference `fig_introduction_drive' on page 3 undefined on input
line 78.

.
!pdfTeX error: pdflatex.exe (file Figures/Introduction_Drive.pdf): cannot find
image file
==> Fatal error occurred, no output PDF file produced!
[pdfLaTeX finished]

AttachmentSize
test.tex3.19 KB
Introduction_Drive.pdf538.18 KB

### You are using the

You are using the \includegraphics macro directly.  You must either provide a complete path to the graphics, or use \graphicspath to point to the graphics.  Also, the underscore in the file name of the graphics can cause a LaTeX error as the _ is seen as the LaTeX subscript command.

Further explanation can be found in this forum at: http://forum.mackichan.com/node/946#comment-1955

There is also a discussion at: http://forum.mackichan.com/node/90