Hi, Henri-Paul.  Please allow me to suggest that you consider using "Easy Templates" to insert your source-code blocks:

    http://orgmode.org/org.html#Easy-Templates


Using the template:

    <s <TAB>

is not only faster than typing:

    #+begin_src

    #+end_src

it also inserts both the begin and end statements simultaneously, thus lessening the chance of a mismatch.

-- Mike


>________________________________
>From: Henri-Paul Indiogine <hindiogine@gmail.com>
>To: emacs-org <emacs-orgmode@gnu.org>
>Sent: Tuesday, September 27, 2011 2:17 PM
>Subject: [O] Error on LaTeX export
>
>I would like to thank you for helping me out with this LaTeX export
>problem.   The enter debugging on error setting was very helpful.  I
>had a missing #+end_src statement.   I have many, many blocks of code
>in a long document, thus it was easy to miss and difficult to find.
>
>Love org-mode!
>
>Henri-Paul
>
>-- 
>Henri-Paul Indiogine
>
>Curriculum & Instruction
>Texas A&M University
>TutorFind Learning Centre
>
>Email: hindiogine@gmail.com
>Skype: hindiogine
>Website: http://people.cehd.tamu.edu/~sindiogine
>
>
>
>