wordpress.wp_post2cat doesn’t exist

I’m getting this error at the top of my 2.3 upgrade when clicking on categories in the sidebar.

Yes. I’ve been reading the threads. Can someone help me out? website is thoughtquotient DOT com.

WordPress database error: [Table ‘wordpress.wp_post2cat’ doesn’t exist]
SELECT SQL_CALC_FOUND_ROWS wp_posts.* FROM wp_posts LEFT JOIN wp_post2cat ON (wp_posts.ID = wp_post2cat.post_id) LEFT JOIN wp_categories ON (wp_post2cat.category_id = wp_categories.cat_ID) WHERE 1=1 AND category_id IN (4) AND (post_type = ‘post’ AND (post_status = ‘publish’)) GROUP BY wp_posts.ID ORDER BY post_date DESC LIMIT 0, 6

I can copy sidebar.php here if that would help.

<div id="sidebar">

<ul>
			<?php 	/* Widgetized sidebar, if you have the plugin installed. */
					if ( !function_exists('dynamic_sidebar') || !dynamic_sidebar() ) : ?>

<li>
				<?php include (TEMPLATEPATH . '/searchform.php'); ?>
			</li>
			<!-- Author information is disabled per default. Uncomment and fill in your details if you want to use it.

<li><h2>Author</h2>
			<p>A little something about you, the author. Nothing lengthy, just an overview.</p>
			</li>
			-->

			<?php if ( is_404() || is_category() || is_day() || is_month() ||
						is_year() || is_search() || is_paged() ) {
			?>
<li>
			<?php /* If this is a 404 page */ if (is_404()) { ?>
			<?php /* If this is a category archive */ } elseif (is_category()) { ?>
			<p>You are currently browsing the archives for the <?php single_cat_title(''); ?> category.</p>

			<?php /* If this is a yearly archive */ } elseif (is_day()) { ?>
			<p>You are currently browsing the <a>/"><?php echo bloginfo('name'); ?></a> blog archives
			for the day <?php the_time('l, F jS, Y'); ?>.</p>

			<?php /* If this is a monthly archive */ } elseif (is_month()) { ?>
			<p>You are currently browsing the <a>/"><?php echo bloginfo('name'); ?></a> blog archives
			for <?php the_time('F, Y'); ?>.</p>

			<?php /* If this is a yearly archive */ } elseif (is_year()) { ?>
			<p>You are currently browsing the <a>/"><?php echo bloginfo('name'); ?></a> blog archives
			for the year <?php the_time('Y'); ?>.</p>

			<?php /* If this is a monthly archive */ } elseif (is_search()) { ?>
			<p>You have searched the <a>/"><?php echo bloginfo('name'); ?></a> blog archives
			for <strong>'<?php the_search_query(); ?>'</strong>. If you are unable to find anything in these search results, you can try one of these links.</p>

			<?php /* If this is a monthly archive */ } elseif (isset($_GET['paged']) && !empty($_GET['paged'])) { ?>
			<p>You are currently browsing the <a>/"><?php echo bloginfo('name'); ?></a> blog archives.</p>

			<?php } ?>

</li>
 <?php }?>

			<?php wp_list_pages('title_li=<h2>Pages</h2>' ); ?>

<li><h2>Archives</h2>
<ul>
				<?php wp_get_archives('type=monthly'); ?>
				</ul>
</li>
			<?php wp_list_categories('show_count=1&title_li=<h2>Categories</h2>'); ?>

			<?php /* If this is the frontpage */ if ( is_home() || is_page() ) { ?>
				<?php wp_list_bookmarks(); ?>

<li><h2>Meta</h2>
<ul>
					<?php wp_register(); ?>

<li><?php wp_loginout(); ?></li>
<li><a href="http://validator.w3.org/check/referer" title="This page validates as XHTML 1.0 Transitional">Valid XHTML</a></li>
<li><a href="http://gmpg.org/xfn/">XFN</a></li>
<li><a href="http://wordpress.org/" title="Powered by WordPress, state-of-the-art semantic personal publishing platform.">WordPress</a></li>
					<?php wp_meta(); ?>
				</ul>
</li>
			<?php } ?>

			<?php endif; ?>
		</ul>
	</div>