Get_header not recognize by single.php

Hi,

My template doesn’t recognize “get_header();” inside the single.php page.
if I remove”get_header”, single.php page work , if i insert them the single.php page get empty.

here is my code

<?php if ( have_posts() ) : ?>

    <?php get_header(); ?>

    <?php while ( have_posts() ) : the_post(); ?>

        <div <?php post_class('post clear'); ?> id="post_<?php the_ID(); ?>">
            <?php if ( has_post_thumbnail() ) :?>
            <a href="<?php the_permalink() ?>" class="thumb"><?php the_post_thumbnail('thumbnail', array(
                        'alt'   => trim(strip_tags( $post->post_title )),
                        'title' => trim(strip_tags( $post->post_title )),
                    )); ?></a>
            <?php endif; ?>

            <div class="post-category"><?php the_category(' / '); ?></div>
            <h2><a href="<?php the_permalink() ?>"><?php the_title(); ?></a></h2>

            <div class="post-meta">par <span class="post-author"><a
                    href="<?php echo get_author_posts_url(get_the_author_meta('ID')); ?>" title="Posts by <?php the_author(); ?>"><?php the_author(); ?></a></span>
                                   le <span
                        class="post-date"><?php the_time(__('j M Y')) ?></span> <em>&bull; </em><?php comments_popup_link(__('Pas de commentaire'), __('1 Commentaire'), __('% Commentaires'), '', __('Commentaires ferm&eacute;s')); ?>
            </div>

        </div>
		<?php get_footer(); ?>
    <?php endwhile; ?>

    </div>

<?php endif; ?>