2.5 – Error using Loop on outside PHP page “Object is not a valid feed template”

I just upgraded to 2.5 (from 2.1) and am having trouble getting posts to appear on an outside PHP page.

The loop code I’m using is below – it’s what I used to show WP posts in previous versions. I now get an error:

“ERROR: Object is not a valid feed template”

I don’t have any plugins activated nor does the loop code reference a plugin. My posts show up fine in the normal WordPress template page, but I need to be able to call them from an outside php file.

Doese anyone know what could be causing this problem?

———————————

<?php /* Don't remove this line. */ require('./wordpress/wp-blog-header.php'); ?>
<!-- // loop start -->
              <?php if (have_posts()) : while (have_posts()) : the_post(); ?>
            </p>
            <h3 class="post" id="post-<?php the_ID(); ?>"><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link: <?php the_title(); ?>">
              <?php the_title(); ?>
              </a></h3>
            <span class="maintext10">
            <?php the_date('m/d/y', '',''); ?>
            </span> <div class="maintext" style="text-align:justify"><?php the_content(); ?></div>
            <?php link_pages('<br />Pages: ', '<br />', 'number') ?>
            <hr size="1">
            <!-- // this is just the end of the motor - don't touch that line either :) -->
            <?php endwhile; else: ?>
            <p>
              <?php _e('Sorry, no posts matched your criteria.'); ?>
            </p>
            <?php endif; ?>