PHP Query causes 404 error

I have been using the code below to post blog posts.

[ Moderator note: please wrap code in backticks or use the code button. Don’t use strong as it mangles the code. ]

<?php
require('../path/wp-blog-header.php');
?>

<?php query_posts('cat=35'); ?>
<?php while (have_posts()) : the_post(); ?>
<a>" rel="bookmark" title="Permanent Link to <?php the_title(); ?>"><?php the_title(); ?></a>

<?php endwhile;?>

I noticed that my site was not being indexed by google. So I used the web testing tools at http://www.webpagetest.org/

The test returns a 404 code which means Google thinks the page do not exist.

I also noticed that my other sites which use the same code do not get 404 errors and are indexed by Google.

The problem is now happening when I put the code on plain page

All the blog posts exist and are displayed properly and the website itself exists and loads quickly

What is causing the 404 error ?

Please help